The Big 4 pattern brands (Simplicity, McCall's, Butterick and Vogue Patterns) sell thousands of ready-made designs in multi-size envelopes and, for many styles, as PDF downloads; you choose a style and a size, then adjust the fit yourself. Sewly drafts a pattern from a photo or a description to your own measurements. Pick the Big 4 for range and for garments Sewly does not cover; pick Sewly when you want a particular look in your exact size.

What are the Big 4 sewing patterns?

Simplicity, McCall's, Butterick and Vogue Patterns are the long-established commercial pattern brands many sewists grew up with, and some of them have been printing patterns since the 19th century. At the time of writing (October 2026), all four are sold together on the Simplicity website, as tissue patterns in envelopes and, for a large part of the catalog, as PDFs you can print on Letter, Legal, A4 or A0 paper.

Their strength is range. Between them they cover everyday clothes, occasion wear, Vogue's designer patterns, costumes, children's wear, accessories and home decor, and their archives hold styles no one else publishes. Paper patterns are also sold in fabric and craft stores in many countries, which suits anyone who would rather not print and tape a PDF.

How does Big 4 sizing work?

Big 4 patterns are multi-size: several sizes are printed on the same tissue, and you choose yours from the body measurement chart on the envelope, not from your ready-to-wear size. Many sewists find they need a larger pattern size than the one they buy in shops. The amount of ease also varies from style to style, so experienced sewists check the finished garment measurements printed on the pattern before cutting. Then come the usual adjustments: blending between sizes at waist and hip, lengthening or shortening, a full bust adjustment.

None of this is a flaw; it is how graded patterns work. But it is the part beginners find hardest. Our guide on choosing your size walks through it.

How does Sewly work?

You show Sewly the garment: a photo, a screenshot, a Pinterest, Instagram or shop link, or a few words. The AI recognizes the garment and its details, chooses the closest garment type in Sewly's library and sets the options (length, neckline, sleeves, fullness, closure, pockets). Sewly's drafting engine then draws every piece from flat-pattern blocks with your measurements and the ease that garment needs.

You can still use a standard size (women EU 32–54, US 0–22, UK 4–26; men XS–3XL; children 2–14 years), but the point is to enter your own measurements. A guided measuring assistant explains each one. Change any measurement or option and the pattern redraws instantly, without using the AI. A 3D mannequin built from your measurements shows the silhouette and proportions before you cut; it is a preview, not a simulation of how the fabric drapes.

When are the Big 4 the better choice?

  • Range. If you want a lined wool coat, a tailored blazer, a shirt with a collar stand, a costume or a wedding dress, the Big 4 have patterns for it. Sewly does not yet draft tailored jackets with lapels, coats, fly-front jeans, shirts with collar stands, lingerie or swimwear.
  • Paper in hand. A tissue pattern needs no printer and no taping.
  • Proven designs. Popular Big 4 patterns have been sewn by many people, and you can find reviews and photos of finished versions online.
  • One-off projects. A single pattern bought once can cost less than a month of a subscription, especially during a sale.

When is Sewly the better choice?

  • You know the look you want. Instead of searching the catalog for something close to a photo, you start from the photo.
  • Fit is your main problem. Drafting from your measurements avoids choosing between two sizes and blending lines on tissue.
  • You want variations of a basic. One skirt or dress can be redrawn with other lengths, sleeves and necklines in seconds.
  • You want instructions for your version. Sewly's guide covers the steps for the options you chose, the pieces list with cut counts, notions, cutting layouts and fabric quantities for 110, 140 and 150 cm (45, 55 and 60 in) wide fabric. You can ask it questions such as "what does staystitch mean?".
  • You print at home or project. Printing (on paid plans) covers A4, US Letter, A3, Tabloid (11 × 17 in), A0, 36 × 48 in and a projector file, with lettered and numbered pages and a test square.

What are the limits of both?

Big 4 patterns ask you to translate your body into their size chart and to know which adjustments to make. Sewly removes most of that work for the garments it drafts, but its library is much narrower, and it picks the closest garment type it knows, so a very unusual detail in your photo may be simplified. Printing a Sewly pattern needs a paid plan, from $7.99 a month or $59 a year. Neither replaces a toile for a close-fitting garment.

Can you use both?

Yes. Keep the Big 4 for the projects that need their range (outerwear, tailoring, costumes) and use Sewly for the everyday pieces you want fitted without alterations: skirts, dresses, tops, sweatshirts and pull-on trousers. Taking your measurements carefully for Sewly also gives you the numbers you need to choose a size on the next Big 4 envelope.