Pattern-making software for home sewers falls into five categories: parametric drafting programs where you draw the pattern yourself from formulas (Seamly2D, Valentina), code-based pattern libraries drafted to your measurements (FreeSewing), made-to-measure services that sell fixed designs sized to you (Lekala, Bootstrap Fashion, Tailornova), professional 3D tools with fabric simulation (CLO 3D, Marvelous Designer), and AI tools that start from a photo or a description. The right one depends on whether you want to learn drafting, pick from a catalog, or start from a picture of a garment you like.
| Category | Examples | You provide | You get | Best for |
|---|---|---|---|---|
| Parametric drafting | Seamly2D, Valentina | Your drafting, formulas, measurements | Any pattern you can draw, resized by measurements | Learning to draft; any garment |
| Code-based patterns | FreeSewing | Measurements, option choices | A finished pattern from a library of designs | Free made-to-measure from a catalog |
| Made-to-measure services | Lekala, Bootstrap Fashion, Tailornova | Measurements, a design from the catalog | A PDF pattern drafted to you | A specific catalog design in your size |
| 3D design tools | CLO 3D, Marvelous Designer | Pattern pieces, fabric settings | Simulated garment on an avatar | Designers, students, 3D artists |
| AI photo-to-pattern | Sewly | A photo, link, sketch or description, measurements | A pattern of that style in your size, with instructions | Sewing a garment you have seen |
Everything below describes what each tool documents about itself at the time of writing (October 2026). Features change; check the current version before you commit time to learning one.
What is parametric drafting software?
Parametric drafting means you draw the pattern as a sequence of points and lines, and each point is defined by a formula instead of a fixed position: "down from A by waist-to-hip", "right by hip divided by four plus 2 cm (3/4 in)". Change the measurements and the whole pattern redraws. It is the digital form of the drafting systems in pattern-making textbooks.
Seamly2D and Valentina are open source desktop programs for exactly this. They share an origin: Valentina was the original project, and Seamly2D continued from it under a different team, so the two look and work alike. Both run on Windows, macOS and Linux, store measurements in a separate file so one pattern can be redrawn for several people, and export to PDF and common vector formats for printing or tiling.
What you need to bring is drafting knowledge. The software draws nothing on its own; you follow a method from a book or a course, point by point. That is the appeal for people who want to understand patterns deeply and the obstacle for people who want to sew this weekend. The Seamly2D and Valentina comparison goes into the workflow in more detail.
What are code-based pattern libraries?
FreeSewing is an open source project where each pattern is a program: the design is written in JavaScript, and the website runs it with your measurements to draw a pattern for your body. You pick a design from a library of more than 100, enter your measurements, choose options such as length, ease and sleeve style, and download a PDF ready to tile or print at a copy shop.
It is free to use and funded by donations. The library is broad and includes garments most consumer tools do not offer, such as shirts with collar stands, coats, swimwear and underwear. Instructions exist for each design, written by the community, and vary in depth. The designs are fixed in construction: you can change their options, but you cannot draft a new garment without writing code. The FreeSewing comparison covers where it fits.
What do made-to-measure pattern services offer?
These sites keep a catalog of designs and draft each one to the measurements you enter, then sell you the PDF. They are the direct descendants of the made-to-measure pattern services of the twentieth century, with the drafting automated.
Lekala has a large catalog that includes jackets, coats and trousers alongside dresses and tops, each drafted to your measurements. Its instructions are brief, and seam allowances are an option to add rather than a default, so it suits sewers who are comfortable with construction and want a wide choice of designs. See the Lekala comparison.
Bootstrap Fashion also sells catalog designs drafted to your measurements, and is known for its made-to-measure dress form patterns, which let you sew a form of your own body. Designs are fixed; you choose among them rather than altering them before purchase. See the Bootstrap Fashion comparison.
Tailornova takes a design-template approach: you combine and adjust templates for necklines, sleeves, lengths and skirts to design your own style, then it drafts it to your measurements. It also produces technical flats and exports CAD formats such as DXF, which makes it attractive to small designers who want to produce patterns for sale. See the Tailornova comparison.
For all three, the fit you get is only as good as the measurements you enter, and none of them measure you; a tape measure and a careful half hour are still the foundation.
What are 3D pattern-making tools?
CLO 3D and Marvelous Designer come from the same company and share a simulation engine. You draw or import flat pattern pieces, place them around an avatar, "sew" the edges together on screen, and the software simulates the fabric falling on the body, with settings for weight, stretch and stiffness. Designers use CLO to reduce physical samples; 3D artists use Marvelous Designer to dress characters for games and film.
They are professional tools with professional learning curves and licensing, and they assume you already have a pattern to put on the avatar: they simulate, they do not draft for you. For a home sewer they are overkill unless you are studying fashion or genuinely want to see fabric behave before cutting. The CLO 3D and Marvelous Designer comparison explains the difference between fabric simulation and a proportions preview.
What do AI photo-to-pattern tools do?
This is the newest category. You upload a photo, a screenshot, a link to a public post or shop page, a photo of a sketch, or you describe the garment in words. The AI identifies the garment type and its details: length, neckline, sleeves, closure, fullness, pockets. A drafting engine then draws the pattern from a library of garment types using your measurements or a standard size, so the drawing is deterministic even though the recognition is AI.
Sewly works this way, with a 3D preview of the proportions on a mannequin built from your measurements, a sewing guide written for the options you chose that you can ask questions, and printing on home paper sizes, copy shop rolls or a projector. The library covers around twenty garment types at launch: skirts, dresses, tops, sweatshirts, pull-on trousers and shorts, a kimono jacket and accessories. It does not draft tailored jackets, coats, fly-front jeans, collared shirts, lingerie or swimwear.
The trade-off is the same as for the catalog services, seen from the other side: you cannot draft an entirely new construction, but you can get a pattern for a garment you saw without searching a catalog for a lookalike. The AI also cannot measure you from the photo; measurements come from your tape.
Which pattern-making software should you choose?
- You want to learn drafting and draft anything: Seamly2D or Valentina, with a drafting book beside you. Expect weeks of learning before your first wearable pattern, and a skill that lasts.
- You want free made-to-measure patterns from a broad library: FreeSewing. Be ready for instructions of varying depth and designs you cannot restructure.
- You want a specific catalog design, including jackets and coats, in your size: Lekala or Bootstrap Fashion, paying per pattern. Tailornova if you want to combine design elements yourself or need DXF output.
- You are a fashion student or designer who needs fabric simulation: CLO 3D. Marvelous Designer if the garments are for characters, not people.
- You saw a garment and want to sew that style in your size: an AI photo-to-pattern tool, provided the garment is one of the types it drafts.
Many sewers end up with two: an AI or catalog tool for everyday garments, and a drafting program or paper and pencil for the one design nothing else can draw.