In general, the right size for a sports bra is the same size you wear for an everyday bra, so start with that size. But sizes vary among brands, so be sure to try on a few different sizes if you are buying a style of sports bra that's new to you.
You know you have the right-sized sports bra when the chest band fits snugly around your ribs without feeling uncomfortably tight, the straps feel secure, but not binding, and the fabric lies smoothly without excessive bunching. For high-impact activities such as running, many women prefer a sports bra that feels tighter than their everyday bras.
|Jennifer Mathes, Ph.D.|