How to Choose Between Two Pattern Sizes

May 30, 2026

Here's something that trips up almost everyone working with sewing patterns for the first time: your pattern size and your clothing store size are not the same thing. And that's actually good news. A pattern is built around body measurements — with more precision and more attention to your actual proportions. Once you understand the logic behind how to choose between two pattern sizes, the decision becomes straightforward.

Start here: shoulder or waist garment?

Every garment belongs to one of two groups.

Shoulder garments hang from your shoulders — shirts, dresses, t-shirts, coats. For these, bust or chest measurement is your anchor. It determines how the garment sits across your chest, shoulders, and back.

Waist garments anchor at your waist — trousers and skirts. For these, hip measurement is what matters most. Why hips and not waist? Because adjusting a waistband is simple. Adding volume through the hips is a much larger project.

Before you open the size chart: decide which group your garment belongs to, then take the right measurement.

How to use finished garment measurements

Every pattern includes finished garment measurements — the actual dimensions of the completed piece, not your body. This is how you understand the fit before cutting.

Compare the finished measurements with your own. Compare them with garments you already own and wear well — a shirt that fits perfectly, trousers that sit right. This gives you a concrete reference instead of an abstract number.

We list finished garment measurements for every size in each pattern. Use them to understand whether the fit will be close to the body or relaxed, and whether that matches what you're looking for. There are no separate ease values — the finished measurements tell you exactly what you'll be wearing.

When your measurements fall between two sizes — go bigger

If your measurements land right between two sizes, choose the larger one. Removing fabric is always possible. Adding it — especially through a structured seam — is a different problem entirely.

A slightly larger size gives you room to adjust. A slightly smaller one doesn't.

If your measurements split across sizes — for example, your chest corresponds to one size but your shoulders to another — use the key measurement for your garment type. Choose by bust for a shirt; choose by hips for trousers. Then check the finished garment measurements to confirm the fit works across your full proportions.

Oversized silhouettes still need the right size

Relaxed fits are forgiving, but "oversized" doesn't mean any size will do. The design intent is built into the measurements, and choosing the wrong size shifts the proportions somewhere they weren't designed to go.

Take Pattern #0103 — men's pleated trousers with a deep-pleat O-shape silhouette. The waistband fits close; the volume through the hips and thighs is intentional. Check the finished garment measurements before you cut — they show exactly what the designer had in mind and where the fit is meant to sit.

Some patterns take a different approach entirely — Pattern #0101, our cape, is one size. The volume is built into the cut, designed to work across a wide range of bodies without a size chart. Read: How to Sew a Cape→

Length: the measurement most people miss

Bust, hips, finished measurements — and then there's length. It's easy to focus on circumference and overlook this entirely, but length matters just as much, especially for trousers and coats. A separate post will cover how to lengthen or shorten a pattern without affecting the rest of the fit.

Use our Size Guide to find your EU size, check conversion charts for US and UK sizing, and compare your measurements with finished garment measurements before you cut. Pattern #0103 is a PDF sewing pattern for men's pleated trousers — A4 and large-format files included with full step-by-step instructions.

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