If your favourite bra suddenly feels tight, loose, or just "off," it's probably not the bra. Bra size isn't a fixed number you find once and keep forever — it moves with your body, sometimes more than once a year. Here's what actually causes it, and what to do when it happens.

What Actually Changes Your Bra Size

• Weight fluctuation — even a 2–3kg shift can move your band and cup size, in either direction.
• Your monthly cycle — hormonal changes can genuinely shift breast tissue day to day.
• Pregnancy and breastfeeding — often the biggest and most dramatic change, and it doesn't always fully reverse afterward.
• Ageing — skin and tissue elasticity naturally shift over time, changing shape and support needs.
• Medication and health changes — some medications and health conditions can affect breast tissue too.

Signs It's Time to Get Remeasured

• Your band rides up at the back instead of sitting level
• You're spilling over the cup, or there's gaping/wrinkling in the fabric
• Straps are digging in or constantly slipping
• You've had a major life change — significant weight shift, pregnancy, or it's simply been over a year

Styles That Move With You

If your size fluctuates regularly — through your cycle, or postpartum — a little built-in flexibility goes a long way. Stretch and wire-free styles are designed to move with you between sizes, not just at one fixed measurement.

Frequently Asked Questions