Your bra is supposed to be tight, but how tight is too tight? According to the experts, it’s too tight if you have spillage. Luckily, there’s a simple way to change this. All you need to do is add more cup.

Spillage can happen in a few places. You may have some bulge by your armpits on the sides of your cup, or overflow around the top of the cup. (We’ll touch on back fat later.) Usually, spillage just means you need a larger cup. Koch says most women misinterpret this overflow by going up in a back size when they really need to go up in the cup size. “Many women are afraid to go up a cup size, but you’d be surprised; it’s a very subtle change. Cup size change is fine tuning, while a band size change is very significant,” says Edmark.