There’s no good evidence that not wearing a bra causes sagging, or that wearing one prevents it. Cleveland Clinic’s breast surgeon says there’s “no proof that wearing a bra at any time of day will decrease breast sagginess”. Research points to other factors instead, chiefly age, pregnancies and smoking.
What the research says
Studies on bras and sagging are limited, but the best-known research looks at what actually predicts sagging, known medically as breast ptosis.
A University of Kentucky study of 132 women seeking breast lift or augmentation surgery between 1998 and 2006 looked at their history in detail. It found:
- Breastfeeding did not affect breast shape. There was no difference in sagging between women who breastfed and those who didn’t.
- Age, the number of pregnancies and smoking were all linked to more sagging.
- Smoking was described as breaking down elastin, a protein that keeps skin firm.
Bra-wearing habits weren’t shown to change the outcome. The researchers were looking at people already seeking surgery, so the results don’t describe everyone, but they’re the clearest data available.
Why a bra doesn’t prevent sagging
A bra holds your breasts while you wear it. It doesn’t change the skin, ligaments and tissue that determine breast shape over time. Those change with:
- Age, as skin loses elasticity.
- Pregnancy, as breasts grow and then shrink.
- Weight changes, which stretch and relax the skin.
- Smoking, which damages skin proteins.
- Gravity, over many years.
So taking your bra off won’t speed this up in any proven way, and keeping it on, including at night, won’t slow it. Our guide on whether you should wear a bra to bed covers the night-time question.
So why wear a bra?
Because it can make you more comfortable and give you the shape you want under clothes. That’s reason enough. A good bra:
- Reduces movement, which matters for exercise and for fuller busts.
- Spreads weight across your back and shoulders.
- Gives a particular silhouette under fitted clothes.
The University of Portsmouth’s breast health research group found that in one survey, 51.5% of 1,659 women reported breast pain, and those women tended to have larger breasts. Their running studies linked poor breast support to a shorter stride. If you exercise, a supportive sports bra is worth having. See our guide to sports bras for large breasts.
Going braless: what to know
Going braless is a personal choice, and there’s no proven harm to breast shape. Some people find it more comfortable; others prefer support, especially during exercise or with a fuller bust. Do whatever feels better for your body.
If you’d like more lift from your bras rather than less, our guide to bras for sagging breasts explains which features help.
