Many of us learned bra sizing once and never questioned it again. A few common mistakes can leave you in a size that “almost” works — until midday discomfort shows up. Here is how to spot them and fix them.

1. Choosing a looser band for comfort — A band that feels “easy” in the fitting room often rides up later. Support comes mainly from the band. It should feel firm on the loosest hook when new.
2. Ignoring sister sizes — If a 34C cup fits but the band is loose, try 32D. Sister sizing keeps cup volume similar while changing band tightness. Always reassess cup fit after you change the band.
3. Letting straps do all the work — Over-tight straps dig in and cannot replace a supportive band. Adjust so they stay in place with only light tension.
4. Sticking to one size forever — Weight changes, hormones, age, and workouts all affect fit. Remeasure periodically instead of rebuying the same label size on autopilot.
5. Judging fit only from the front — Check the back view too. A riding band, gaping cups, or a floating centre gore are clearer from the side and back.
6. Buying only by looks — Lace and colour matter — after fit. A beautiful bra in the wrong size will not stay beautiful to wear.