Fit Problem: Breast tissue spills over the cups

The short answer: The cup volume is too small for your tissue, or the style cuts too low for your shape. Go up one cup letter at the same band. If spillage is only at the sides, look for styles with taller side panels.

Spillage means tissue escaping the cup: over the top edge (the classic quad or double-boob line), at the sides toward the underarm, or from the bottom when the wire sits on tissue instead of under it. All three say the same thing, the cup's volume or coverage is less than the tissue it is asked to hold, but the location tells you what to change.

Top spillage at an otherwise fitting band is the cleanest case: go up one cup letter at the same band, 34C to 34D. Side spillage often responds better to construction than to letters: styles with taller side wings and side-support seams gather tissue forward, which particularly suits soft tissue and east-west shapes. Bottom escape means the whole frame is misplaced, usually a band too loose letting the wire drift up onto tissue; fix the band first, then reassess the cup.

Before buying anything, do the scoop test in the right size: lean forward, settle all tissue into the cups, stand and look. If the cup edge now cuts across the top, the cup is truly small. If everything sits contained, your old size was fine and the spillage was a wearing-routine issue, which is free to fix.