What Vanity Sizing Means When You Buy Underwear
Short answer: Vanity sizing means a brand gives a garment a smaller size than its measurements really suggest, so the same size can fit differently from brand to brand. Here is what vanity sizing means when you buy underwear and how to choose well.
What vanity sizing is
Vanity sizing describes the fact that size labels do not follow a common standard. One brand can let a medium run larger than another brand's medium, which can leave you confused when you shop. Nothing is wrong with you when a size fits differently. It is the size label that varies.
Why it matters in underwear
Underwear sits close to the body, so you notice a deviation faster than in looser clothes. A size too small presses at the waistband and legs, while one too large slips and bunches. Browse bamboo underwear for women and read each brand's size guide instead of assuming your usual size.
Measure yourself and use the numbers
Measure waist, hips and possibly bust with a tape and write the numbers down. Compare them with the brand's own guide, not with the labels of other brands. If the guide is in centimetres, follow the centimetres, and treat the letter or number as a hint and not as the answer.
Use your own clothes as a yardstick
If you own a pair of underwear that fits perfectly, lay it flat and measure it from waistband edge to edge. That gives you a number to compare with the size guide. Remember that the stretch of the fabric matters, so measure without stretching. Note the number for the next time you shop.
When the guide does not fit
Sometimes the guide does not match your measurements, or you are between sizes. Choose by the part that is hardest to fit and think about whether you want the underwear close or loose. Read reviews too, if there are any, and see whether others describe a cut as small or large.
What stretch and fabric mean
Viscose from bamboo in a knit often gives a little, which can forgive a size up or down. If the fabric has no stretch, the fit is more exact. Check what the product page says about the material, and remember that viscose can shrink a little if you wash at high heat.
Bras and other pieces with several measurements
A bra has both band and cup, so it is even more important to hold on to the measurements. Look at the bamboo bra without underwire and read how the size is described. Measure under the bust and over the bust and compare with the guide. Try two sizes if that is possible.
How to avoid the mistake next time
Keep a list of your measurements and the sizes that have fitted in each brand. Check whether a top or a layer should sit over the underwear, for example a women's long-sleeved bamboo T-shirt, so you know how the whole feels. That makes the next purchase quicker and surer.
Frequently asked questions
Why does my size not fit in every brand
Because brands do not follow a common standard. A medium at one brand can match a large at another. Use the measurements in each brand's own size guide rather than the letter.
Should I buy a size up or down in underwear
It depends on the brand, the cut and the fabric. Follow the guide, measure yourself and think about whether you want the underwear close or loose. If in doubt, read reviews or ask customer service.
Does underwear shrink in the wash
Viscose can shrink a little, especially at high heat. Wash by the label and at a low temperature, and avoid hard tumble drying so the fit lasts.
