Feel like you’re between sizes? Join the club. It’s normal.
If the band rides up your back, it’s too big. Go down a band size and up a cup size. That’s called “sister sizing.”
How to Measure Your Bra Size Accurately? - Girly Galleria
If your straps are digging trenches into your shoulders, the band is too loose. The straps should do almost nothing—the band is the real boss.
That “Swoop and Scoop” Move You Keep Hearing About
Once you try on a bra, you have to do the ritual. Lean forward slightly.
Swoop all your breast tissue from under your armpits into the cup. Then scoop upward.
Straighten up. You should look like you just got a free lift. That’s the correct fit.
If you spill over the top or sides, the cup is too small. If you have gaping fabric at the top, it’s too big.