Best fit for independent digital pattern sellers
- Choose CLO when you want to edit grading values by size and review pattern and graphic placement across the size range in one 2D window.
- Compare Gerber AccuMark, Optitex, Lectra Modaris, and TUKATECH when the work expands into factory CAD, measurement-driven development, markers, or virtual samples.
- Validate fit against your size chart and target bodies; a clean-looking size nest alone does not establish garment fit.
For a seller publishing downloadable sewing patterns, CLO is the clearest starting point among these five when the priority is hands-on grading edits and cross-size 2D review. CLO documents both choosing a size to edit grading values and, in release 2026.1, reviewing patterns and graphic placement across all grading sizes in one window. As orders move toward small-batch manufacturing, compare the production and handoff needs of the factory with Gerber AccuMark, Optitex, Lectra Modaris, or TUKATECH before changing workflows.
What to compare before choosing grading software
Start with your deliverable. A PDF-first business needs to control a size chart, change grade values, inspect each size, and create clear printable files. A seller sending work to a factory also needs an agreed CAD format, measurement specifications, grading data, and a repeatable way to pass the files between systems.
A grade rule defines how measurement points change across sizes. The apparel fit-and-grading guidance from Capital World Group describes grade rules as the changes at each measurement point that maintain proportional balance across sizes and garment categories. That makes point-level edits, visibility across the range, and fit checks more useful selection criteria than a long feature list.
Data table · Scroll horizontally to see all columns. Arrow keys work when focused.
| Decision criterion | What to look for | Why it matters to a pattern seller |
|---|---|---|
| Grade-rule control | Edit the values at the points that shape the garment, by size or across a range | A change to the bust, waist, hip, sleeve, or length can affect fit and proportions differently. |
| Size-range review | Inspect the base and graded sizes together, in 2D and, if useful, 3D | A seller can catch a point or graphic that shifts unexpectedly before preparing customer files. |
| Fit validation | Compare measurements and review garments on representative bodies | A mathematically graded pattern can still need changes for the intended body shapes and fit. |
| Handoff | Confirm file format, units, size groups, grading data, and naming with the production partner | A file that opens in the factory’s system still needs to carry the intended sizes and measurements. |
The University of Minnesota’s summary of an apparel-grading study shows why fit deserves its own check. Researchers compared a sheath dress in Misses sizes 6–20, fitting traditionally graded garments to participants and comparing them with fit-to-shape patterns through quantitative and visual analysis. The largest differences appeared between sizes 14 and 16, and the study reported fit issues in the tested traditional grading. Its findings concern that dress and size range, but the practical lesson for software selection is broad: test how your own pattern behaves across its intended range.
Production handoff also depends on the buyer’s specification, rather than one universal file convention. For example, the URBAN OUTFITTERS vendor manual tells vendors to use the block pattern and adjust it as directed by the tech pack, including fit intent and advised measurements. Before repeating factory handoffs, document the receiver’s required pattern format, units, size range, and supporting measurements or notes.
When CLO fits a digital pattern seller
CLO suits a seller who wants to work directly with the size-by-size grading values, then inspect how the range looks before publishing. In CLO’s Set Grading guide, the user selects the size to edit, chooses a pattern outline or point, and enters a value in the Property Editor. The guide also documents a grading distance for each size from the base-size segment or point, plus an offset option for adjusting the relationship between sizes.
That is useful when a test fit calls for a precise correction. For example, if a sleeve point needs a different movement in one size than in adjacent sizes, the grading editor lets the user select a size and adjust its value rather than treating the entire range as one undifferentiated shape. CLO’s guide also describes floating the grading table to compare size differences.
For visual review, CLO’s 2026.1 feature page documents 2D Grading Review: users can compare 2D pattern and graphic placement across all grading sizes in a single window. That makes CLO a strong fit for a PDF pattern seller checking that a pocket, print, or pattern shape remains positioned as intended as sizes change. The feature is explicitly tied to CLO 2026.1.
CLO also has a documented DXF route for production partners. Its 2D Pattern DXF Import/Export guide lists DXF-AAMA, DXF-ASTM, and Standard DXF, formats for exchanging pattern data between CAD systems; grading information can travel in the DXF or in a separate Rule File. CLO exports one grading size group per DXF file, so a factory requesting multiple size groups may need separate exports.
When to compare Gerber AccuMark
Gerber AccuMark is worth comparing when production work includes marker making, planning, or a manufacturing partner already uses Gerber’s CAD environment. Gerber’s AccuMark Made-to-Measure overview describes AccuMark as pattern design, grading, marker making, or arranging pattern pieces for fabric cutting, and production-planning software; Batch Processing generates orders, plots, and cuts. Those functions address a broader production workflow than preparing a set of downloadable pattern PDFs.
AccuMark’s Professional Edition 12.2 notes document Proportional Grading, which grades a piece from a chosen stack point or its center using linear values or percentages of the piece’s size. Gerber identifies lingerie and swimwear as areas where proportional grading is common. Choose proportional grading for lingerie or swimwear when its increments match the intended grade rules and measurement chart.
The same 12.2 notes describe a Standard DXF export setting for centimeters or millimeters, with an important handoff detail: the Standard DXF stores values but does not identify the selected unit. The sender therefore needs to communicate the unit for import. For a small brand, this is a practical reason to document units in the file package and confirm them with the receiving team before production.
When Optitex suits 2D work plus multi-size visualization
Optitex is a fit when a seller wants 2D pattern work alongside 3D sample visualization, especially when product development uses structured measurement data. Its 2D/3D CAD product description describes grading a base or sample-size pattern into additional sizes and visualizing virtual samples in 3D. That combination can help a team review the same style as it moves from the pattern to a multi-size visual sample.
Optitex’s O/26 release notes describe a Dynamic Measurement Chart that imports Excel measurement data to create patterns and Pattern Design Software (PDS) files, synchronizes selected measures with grading tables, and generates all measures in one action. This is relevant when the seller’s size specification lives in a spreadsheet and the business is beginning to share measurement-driven files with a development or factory partner.
For download-only businesses, the value of those connections depends on whether the seller uses 3D review or reuses measurement specifications across styles. For production orders, run a sample export through the receiving CAD workflow and verify that its measurements, grading data, and pattern details arrive as intended.
When Lectra Modaris makes sense
Lectra Modaris is a candidate when grading sits inside a wider pattern-development operation that values rule-based pattern changes and shared development files. Lectra’s current Modaris product page says Modaris Expert’s parametric, or rule-based, capabilities can save up to 30% of pattern-adjustment time.
Lectra’s Modaris Expert brochure describes organizing, storing, retrieving, and reusing garment-development assets, a workflow a pattern team can apply to shared patterns and blocks. Those capabilities are most relevant to a seller who is growing into a design team with repeat styles, shared pattern blocks, and established development practices. An individual publishing occasional PDF patterns may find that enterprise-oriented workflow more than the current job requires; a small brand coordinating collections may value that continuity.
When to evaluate TUKATECH
TUKATECH fits a seller moving toward production patterns, grading, markers, and virtual sampling in connected workflows. Tukatech describes TUKAcad as a CAD room for pattern making, grading, and marker making. Its product page says users can build production patterns, control brand fit, grade every size, and prepare markers without rebuilding data between systems.
For measurement-led pattern creation, Tukatech describes TUKA APM as automatic pattern-making software. The workflow uses measurement values to generate a pattern and grade rules. TUKA APM is a separate module in the TUKAcad environment, so sellers should evaluate it as an additional product component rather than assume it is included in every TUKAcad setup.
Tukatech’s TUKA3D product page presents it as 3D sample-making software for design and fit, with features intended to eliminate physical samples from product development. TUKATECH suits small brands that want patternmaking, grading, marker preparation, and virtual sample-making connected; prioritize it when the manufacturing partner accepts the planned output files.
How to evaluate a graded range before releasing a PDF
- Set the target chart and base size. Record the intended body measurements and garment measurements for the range. Keep the base pattern and the chart together so each grading decision refers to a defined starting point.
- Review grade rules at the measurement points. Check the changes that determine the silhouette, such as chest, waist, hip, length, and sleeve measures in your chart. Compare those intended changes with the values entered in the software.
- Inspect the size nest, the pattern pieces displayed across the graded sizes. Review each size for proportion, piece alignment, and the placement of important graphics or details. CLO 2026.1’s 2D Grading Review can show pattern and graphic placement across grading sizes in one window; this is a visual review step, alongside any measurement checks.
- Fit representative sizes. The University of Minnesota study recommends multiple fit modes, or separate fit-model groups, when a range spans more than five sizes. The researchers place each fit model near the middle of a group that covers no more than two sizes above or below that model’s size. In that study of a sheath dress in Misses sizes 6–20, the researchers found the greatest difference between traditional grading and fit-to-shape patterns between sizes 14 and 16.
- Record corrections and prepare the handoff. Update the grading values after fit checks, then export the agreed size group, format, units, and grading information. If your supplier asks for technical notes or measurements, send the version that matches the final pattern.
A useful independent measurement check can be done before a physical sample: compare the expected values in the chart with the corresponding pattern points in every size. Then use fit models or samples to review garment shape and comfort on bodies. Pattern review and fit review answer different questions, so combine them when the size range or production commitment makes fit risk consequential.
Which tool should you choose now?
Data table · Scroll horizontally to see all columns. Arrow keys work when focused.
| Your current need | Best tool to shortlist | Why it fits |
|---|---|---|
| Publish graded PDF patterns and edit values by size, with a fast visual check across the range | CLO | Its grading editor supports selected-size value changes, and CLO 2026.1 adds single-window 2D review across grading sizes. |
| Move into factory CAD, proportional grading, markers, and production planning | Gerber AccuMark | Gerber documents grading and production-room functions, including marker making and planning. Its Standard DXF export stores measurement values without embedding the selected centimeter or millimeter unit, so communicate the unit with the file. |
| Work from spreadsheet-based measurement data and review graded styles in 2D and 3D | Optitex | O/26 documents Excel measurement-chart import and generation, while Optitex describes 2D grading and 3D visualization. |
| Manage parametric pattern changes and reusable development assets across a team | Lectra Modaris | Lectra positions Modaris Expert around parametric patternmaking and organizing garment-development assets. |
| Connect production patternmaking and grading with markers and virtual samples | TUKATECH | TUKAcad covers patternmaking, grading, and markers; TUKA3D provides the companion virtual sample workflow. |
For a solo seller whose immediate deliverable is a customer-ready PDF, begin with CLO’s documented grading edits and 2026.1 review workflow, then add production-oriented CAD when a real partner’s file requirements call for it. If a factory already defines the system, format, or marker process, let that handoff requirement drive the shortlist.
FAQ
Does a graded pattern nest prove that the garment fits?
No. A nest shows how pattern pieces change across sizes; fit evidence comes from measurements and review on representative bodies. The University of Minnesota study compared traditionally graded garments with fit-to-shape patterns on participants and found meaningful differences in its tested sheath-dress range.
Can CLO export a graded pattern for a factory?
Yes. CLO’s DXF export offers DXF-AAMA, DXF-ASTM, and Standard DXF, with grading information included in the DXF or exported as a Rule File. One size group exports per DXF file, so prepare separate files when the factory requests separate groups.
When should a PDF seller move to production-focused software?
When a manufacturing partner’s workflow requires CAD grading data, production markers, measurement-driven development, or virtual sample review. Choose the product around that specific requirement rather than buying a broader production suite before the workflow calls for it.
How should I choose sizes for fit checks?
For example, a 10-size range can be split into two five-size fit groups, each centered on its own model; the University of Minnesota study recommends groups extending no more than two sizes above or below the model in its Misses 6–20 sheath-dress study.