CLO 3D and Marvelous Designer are professional 3D garment software: you create pattern pieces, stitch them together virtually and simulate how the fabric drapes on an avatar. Sewly is a pattern maker for home sewists: it drafts a printable pattern from a photo or a description to your measurements. If you design clothes professionally or build 3D characters, the CLO tools are the right kind of software; if you want to sew a garment this weekend, Sewly is.

What are CLO 3D and Marvelous Designer?

Both are made by CLO Virtual Fashion. CLO, often called CLO 3D, is aimed at fashion designers, studios, brands and schools. You create 2D pattern pieces, sew them in 3D on an avatar, and the software simulates fabric with physical properties such as weight, stretch and stiffness, so you can judge fit, silhouette and materials before making a physical sample. It is widely used for virtual sampling in the fashion industry and has academic programs for schools.

Marvelous Designer uses the same idea of sewing 2D patterns into 3D garments but is aimed at 3D artists: it is built for dressing characters in game development, animation and visual effects.

At the time of writing (October 2026), both are desktop software for Windows and macOS (Marvelous Designer also runs on Linux) and are sold by subscription. Marvelous Designer is rental-only, with personal and enterprise plans; CLO offers individual and enterprise plans, a free trial and options for students.

How is Sewly different?

Sewly is not a design or simulation tool; it is a pattern maker. You show it the garment (a photo, a screenshot, a Pinterest or Instagram link, or a description), and it recognizes the garment, picks the closest type from its library and drafts every piece from flat-pattern blocks with your measurements and the right ease. You never draw a curve yourself.

The 3D view shows the garment on a mannequin built from your measurements, in a plain color or with the print from your picture. It is a preview of silhouette and proportions, not a physics simulation: it will not show how a heavy wool drapes differently from a silk. What Sewly gives you instead is what a home sewist needs next: a true-scale PDF on A4, US Letter, A3, Tabloid, A0, 36 × 48 in or for a projector (on paid plans), seam allowances included, and a step-by-step sewing guide you can ask questions, with fabric quantities and cutting layouts.

When is CLO 3D or Marvelous Designer the better choice?

  • You need realistic drape. If you want to see how a fabric behaves, compare materials or check tension on a fitted garment virtually, a physics-based simulator is the tool. Sewly's preview does not do this.
  • You design professionally. CLO's pattern, fabric and colorway tools serve design teams and fashion students.
  • You make 3D assets. For games, film or animation, Marvelous Designer is built for the job.
  • You need any garment at all. Since you create the pattern yourself, there is no library limit: coats, tailoring, lingerie, costumes.

When is Sewly the better choice?

  • You want to sew, not model. Sewly turns an image into a pattern you can print and cut, without learning 3D software or pattern drafting.
  • You do not have pattern-making skills. CLO and Marvelous Designer are built for people who create or import pattern pieces; getting a sewable, well-fitting pattern out of them takes pattern-making knowledge. Sewly drafts the pieces for you.
  • You want instructions. The professional tools do not write sewing steps for a home sewist; Sewly's guide does, with the pieces list, notions and cutting layouts for your version.
  • You want a lower cost and no installation. Sewly runs in the browser and inside ChatGPT and Claude; the free plan includes the 3D preview, and printing starts at $7.99 a month or $59 a year.

What are the limits of both?

CLO and Marvelous Designer have a steep learning curve and professional pricing, and they are built for designing and visualizing garments rather than for producing a home-print pattern with a sewing guide. Sewly drafts only the garment types in its library (20 at launch) and does not yet draft tailored jackets, coats, fly-front jeans, shirts with collar stands, lingerie or swimwear. Its 3D preview helps you judge proportions, but a toile remains the real test of fit.

Can you use both?

They rarely replace each other. A fashion student might develop collection pieces in CLO and sew everyday clothes from Sewly patterns. If you are a home sewist curious about 3D, Sewly's preview on your measurements answers the question most people have before cutting (is this length right on me?), and our article on why see your garment in 3D before you cut explains why that preview is worth a look.