The size guide before you buy

Sep 12, 2026

Short answer: Most wrong purchases happen because the size was guessed. Five minutes with a tape measure and the guide on the product page removes almost all of the risk, and you avoid sending something back because it is too tight or too loose.

Why guessing goes wrong

Many people order their usual size without checking. It often works, but not always. Sizes are not the same across brands, and even within one brand a style can be cut differently from another. A quick look at the guide before you order saves you the hassle of exchanging afterwards.

Measure instead of guessing

Bust, waist and hips are the three measurements that decide most of it. Use a soft tape and measure over thin clothes or on the skin. Keep the tape level and close, but do not pull it tight. Write the numbers down so you have them next time. See bamboo underwear for women.

Compare with something you own

Lay a piece you know and like flat and measure it. Measure the width under the arms and the length from shoulder to hem. Compare with the guide, and you can see whether the new piece will sit the same way. It works well for T-shirts and tops. See bamboo T-shirts for women.

Between two sizes

Choose the smaller one if the fabric has stretch, and the larger one if it does not. A stretchy fabric gives and follows the body, so a slightly smaller size still feels comfortable. Without stretch there is no margin, so the larger size is safer. The fabric is listed in the product text. See bamboo panties.

Think about how it should sit

The same measurements can lead to two choices, depending on how you like to wear your clothes. If you want a T-shirt that sits close, you choose differently from someone who prefers a bit of room. Read about the fit in the product text and use it alongside your measurements.

Underwear needs extra care

Size matters especially for underwear, because it sits close all day. Too tight rubs and presses, too loose slips and folds. Measure hips and waist carefully and choose from the guide. Worn underwear often cannot be returned for hygiene reasons, so it pays to get it right first time.

Sizes from other brands

You can use your size from another brand as a starting point, but no more than that. Brands cut differently, and a medium at one can match a small or large at another. The guide on the product page is always more precise than your memory of your usual size.

Keep your measurements

Once you have measured yourself, you have a tool for every future purchase. Save the numbers on your phone and check them again if things change. Then comparing with the guide takes only a moment next time you shop. Those five minutes pay off many times over.