Why sizes are not the same everywhere

Short answer: Because there is no binding standard for clothing sizes. Each brand sets its own measurements based on the body type the clothing is designed for. That is why the same size can fit differently from brand to brand, and why your own measurements are the best guide.

No shared standard

There are guideline systems for sizes, but none of them is binding. Each brand is free to decide what a medium should measure. So medium can mean different things, even when comparing within a range such as the men's bestsellers. It is nobody's mistake, it is simply how the industry works, and it helps to know.

The brand's body type decides

A brand designs clothing for a particular figure, with set proportions between shoulders, chest, waist and length. If that figure matches yours, the sizes usually fit throughout the women's range. If it does not, something will always feel slightly off, whichever size you choose. Then the cut is the issue, not the size.

That is why measurements matter more

Centimetres are the only thing that does not shift between brands. A letter or a number is just a label, while the measurements show how the clothing is actually cut. Use the chart for the women's bestsellers rather than the letter, and compare with your own measurements to see how it will fit.

Same size, different cut

Two medium jumpers can have the same chest width but a different length, sleeve length and shoulder width. One brand may cut short and wide, another long and narrow. When comparing, look at more than the chest. Length and shoulder often say more about the fit than the number on the label.

The fabric plays a part too

A soft fabric with stretch feels different from a firm fabric, even with identical measurements. Stretch gives room and shapes itself to the body, while firm fabric holds its form. So one size can feel roomy in one quality and snug in another. Check the fabric composition when comparing two similar styles.

How to use a size chart

Start by finding out whether the chart shows body or garment measurements. Measure your chest, waist and hips, then compare with the right column. If you fall between two sizes, think about whether you prefer clothing close or loose. A piece that already fits you well is a useful reference when judging the numbers.

Buy one piece first

When trying a new brand, it is a good idea to start with a single piece. Wear it for a few days, wash it and see how it fits afterwards. If it fits, the rest of the range will very likely fit too. Then you can add more styles in the same size without guessing.

Note what fits

Write down which size you wear with each brand, and how it fits. It sounds like a lot of effort, but it saves time and returns in the long run. Once a brand has proven to suit your figure, it is easy to go back. And when you try something new, you have a clear point of comparison.

Frequently asked questions

Can you trust the size chart

Yes, if it gives body measurements and not only garment measurements. Read what the numbers describe and compare with your own measurements before choosing a size.

Why does the same size fit differently

Because the cut is different. Two mediums can share a chest width but differ in length, and that changes how the garment sits on the body.

Should you always try before buying more

Yes. Buy one piece first, then add more once you know the fit is right. That way you avoid ending up with several pieces that do not fit well.