How to choose the size on a sewing pattern?

This is one of the most frequently asked questions in sewing, and also one of the main causes of disappointment when a garment does not fit as expected. Too tight, too loose, poorly fitted... in the vast majority of cases, the problem is neither the fabric nor the technical skill level, but rather a poor choice of size on the sewing pattern.

Unlike ready-to-wear clothing, patterns use specific sewing measurement charts. Relying solely on your usual size is therefore a common mistake. To choose the size of a sewing pattern correctly, it is essential to take your measurements, know how to compare them with the chart provided, and understand when and how to adjust a sewing pattern to suit your body shape.

In this article, you will discover how to choose the size on a sewing pattern step by step, without stress or guesswork. We will look at which measurements really matter, how to read a size chart, what to do when your measurements fall between sizes, and how to avoid size errors on a sewing pattern. The goal is simple: to help you sew clothes that truly fit you, from the very first cut.

Why is choosing a size on a sewing pattern often problematic?

Choosing the right size is the most decisive step, even before cutting the fabric. Yet many sewists, both beginners and experienced, encounter difficulties at this stage. Understanding the source of these errors already helps avoid most size-related mistakes.

Pattern size vs. commercial size: a common confusion

The sizes indicated on a sewing pattern almost never correspond to ready-to-wear clothing sizes. Pattern brands base them on standardized measurements, which often differ from modern commercial sizes.

In other words, wearing a size 38 in a store does not mean that you will need to cut a size 38 on a pattern. This is precisely why choosing the size on a sewing pattern can never be reduced to a simple habit.

The most common mistakes when choosing your size

Even with experience, certain mistakes occur very often. Identifying them helps you avoid them from the outset.

• Relying solely on your usual clothing size
• Not taking your measurements accurately
• Ignoring the supplied measurement chart
• Choosing a single size despite having different measurements
• Forgetting the ease included in the pattern

These mistakes explain why so many projects end up with a poorly fitting garment, even though the pattern itself was perfectly correct.

How do you take your measurements correctly for a sewing pattern?

Before trying to understand how to choose a size on a sewing pattern, you must have reliable measurements. Approximate measurements will skew the entire process, even with the best pattern.

The essential measurements to know

Certain measurements are essential and serve as the main reference for choosing a pattern size.

• Bust circumference (at the fullest point)
• Waist circumference (at the narrowest point)
• Hip circumference (at the widest point)
• Height or length, depending on the pattern

These measurements are systematically used in pattern size charts.

Practical tips for avoiding measurement errors

To obtain reliable measurements, a few simple rules make all the difference. The tape measure should lie flat without being tight, and the person should stand up straight without pulling in their stomach.

It is recommended to:

• Wear close-fitting clothing
• Have someone else help you
• Write down the measurements immediately
• Take the measurements twice for verification

Some sites, such as Burda , offer a detailed guide to taking sewing measurements, recognized as a reference by many professionals.

How do you read and use a sewing measurement chart?

The measurement chart is the essential tool for understanding how to choose a size on a sewing pattern. However, it is often misinterpreted or only partially used.

Where can you find the size chart on a pattern?

The chart is generally located:

• On the paper pattern envelope
• In the instruction booklet
• On the designer’s website for PDF patterns

It shows the correspondence between measurements and the available sizes. According to IFTH (French Textile and Clothing Institute), these charts follow precise standards designed to ensure a consistent basis for textile construction.

👉 To learn more: learn how to read a sewing pattern.

Which size should you choose if your measurements fall between two sizes?

This is one of the most common situations. Very few people correspond perfectly to a single size. In this case, it is recommended to choose the size corresponding to the garment’s most fitted area.

Body-shape situation	Preferred size	Recommended adjustment
Fuller bust	Bust size	Adjust waist/hips
Wider hips	Waist-hip size	Adjust the bodice
Mixed measurements	In-between size	Grading between sizes

This reasoning is essential for fully understanding how to choose the size on a sewing pattern without compromising the final fit.

Should you adjust a sewing pattern before cutting?

Even after choosing the right size, a pattern remains a standard template. Adjustments are often necessary to achieve a garment that truly suits your body shape.

When should you adjust a sewing pattern?

An adjustment is recommended if:

• Your measurements do not correspond to a single size
• You have a specific body shape (full bust, defined waist, wide hips)
• The design is very fitted

Adjusting does not mean “correcting a mistake”, but personalizing a pattern so that it fits you.

The most common adjustments according to body shape

Some adjustments are very common and relatively simple to make.

• Lengthen or shorten a pattern
• Adjust the waistline
• Adjust the hip fullness

Bonus: How to choose the right size on a sewing pattern

This section goes beyond the basics and helps you safeguard your sewing projects, even with complex designs.

Professional seamstresses’ tips

Professionals often follow these practices:

• Always check the finished garment measurements
• Compare the pattern with a similar garment that fits well
• Add adjustment allowances if necessary

These habits help avoid most size errors on a sewing pattern.

Testing the size with a toile: why it is essential

A toile (or calico) is a prototype sewn from inexpensive fabric. It allows you to validate your size choice before cutting the final fabric.

It is the most reliable tool for confirming that you have correctly understood how to choose your size on a sewing pattern, especially for fitted garments.

Conclusion: choosing the right size on a sewing pattern

Choosing the right size on a sewing pattern relies on a clear method: take your measurements accurately, compare them with the measurement chart, choose the size suited to your body shape, and adjust it if necessary. By truly understanding how to choose the right size on a sewing pattern, you gain confidence, precision, and enjoyment. This often-underestimated step is the key to creating garments that fit well and flatter your silhouette, project after project.

FAQ: How to choose the right size on a sewing pattern

Which pattern size should you choose when you are new to sewing?

It is advisable to rely strictly on your body measurements rather than your usual clothing size, even if this seems confusing at first.

Can you mix several sizes on the same pattern?

Yes, this is a common practice called grading. It allows you to adapt the pattern to different parts of the body.

How can I tell if a pattern runs large or small?

You should check the finished garment measurements and compare them with an existing garment that fits you well.

Should I always make a toile before sewing?

It is not mandatory, but highly recommended for fitted garments or complex patterns.