You buy bras that fit on the tightest clasp
Instead, choose bras by how they feel on the loosest hook. As the bra ages and the band stretches, you’ll have the option of tightening its grip.
You haven’t been fitted in years
Your bra size can fluctuate from year to year with changes in weight, muscle tone, pregnancy, and age. Get fitted in person, suggests Christina Faraj, a professional bra fitter in Beacon, New York. “There are charts that will tell you how to fit a bra, but they’re not fool proof,” she says. “It’s a very individual process.” If you can’t get fitted, start with the standard bra-size formula: 1) Measure your band size by looping a measuring tape from your back to front directly under your bust and across your rib cage. If you get an odd number, round up to the next even number to get your band size. 2) To find your cup size, measure loosely around the fullest part of your chest and subtract your band measurement from this bus measurement. The difference calculates your cup size (a one-inch difference is an A cup; a two-inch difference is a B cup, etc.).