Key Points. No, going braless doesn't cause sagging—despite decades of marketing that told women otherwise. Breast ptosis (sagging) is largely driven by age, gravity, pregnancy, and genetics—not the absence of a bra. The bras most women wear might actually be doing more harm than good.
10 Side Effects of Not Wearing a Bra
Wearing or not wearing a bra has no effect on breast sag or perkiness. Genetics, aging, pregnancy* and weight fluctuation can all contribute though.
“Wearing a bra doesn't prevent your breasts from sagging, and foregoing one doesn't cause your breasts to sag,” she reports. Breast ptosis (the medical name for breast sagging) happens over time, as your skin naturally loses some of its elasticity.
A constant weight is more likely to allow your breasts to stay in a consistent position. A good posture – Although keeping a good posture won't fully correct sagging breasts, it will make your breasts appear to be more lifted. Avoid slouching and sit with your shoulders back and your back straight.
You can't completely restore the original shape and position of your breasts, but there are steps you can take in your daily life to improve the look and lift of your bust.
If you sleep on your side this may cause your breasts to sag more over time. This is because one will dangle downward and the ligaments will stretch.
The "3 bra rule" is a guideline recommending you own at least three bras for a simple rotation: one to wear, one to wash, and one to rest (in the drawer), allowing elastic to recover between wears to extend the bra's lifespan and maintain fit. This system prevents wearing the same bra daily, which stretches out the elastic and reduces support, helping bras last longer.
Sagging itself can happen prematurely purely due to genetics. If none of these factors are present though, the breasts tend to start sagging around the same time as the face, though it can be slightly after. This usually happens somewhere between the ages of forty and sixty.
Bras that Prevent Breast from Sagging
A common question I get in practice is: “Is it bad to not wear a bra?” The short answer: not necessarily. Going braless isn't inherently harmful—especially during low-impact activities or in everyday life. However, there are specific situations where support can help protect your breast structure and improve comfort.
“There hasn't been any scientific evidence that not wearing a bra has any long-lasting effects, but we do know that skin can begin to sag over time with gravity and other natural effects, supporting 'the girls' is an important part of preserving lift and elasticity in the skin tissue,” explains Donofree.
The "two-finger rule" for bra fitting is a quick test to check if your bra band is the right tightness: you should be able to comfortably slide two fingers (stacked or side-by-side) under the band at the back, but not much more, indicating it's snug enough for support without being too tight or riding up; the band should feel supportive and stay level, with straps only providing slight lift, not carrying most of the weight.
There can be health benefits of not wearing a bra, such as improved blood circulation and reduced pressure on your shoulders and back. For some women, going braless can also help prevent breast pain and skin discomfort, especially after a long day of wearing tight underwire bras.
The good news: If you typically wear a bra daily, going for a few weeks without the garment, even if 24/7, "definitely won't have a significant effect," she says. Aside from sagging, there's also the issue of back pain.
Breast sagging occurs due to reasons such as age, the effect of gravity, weight gain and loss, and loss of skin elasticity. It is the threadlike breast tissue that keeps the breasts upright and vibrant. Over time, these threadlike ligaments also loosen, and breast sagging occurs.
Can Sagging Breasts Be Firm Again? Sagging breast tissue cannot regain its youthful firmness without plastic surgery. Unfortunately, measures such as exercising your chest muscles, eating healthy, and applying topical creams are not enough to correct pronounced sagging and drooping.
By the age of 17, breasts will usually be fully developed, although this may take a bit longer. If a girl's breasts start to develop at a younger age, this doesn't mean she'll have bigger breasts than someone who starts to develop later. The rate at which breasts grow is different for everyone.
If you have sensitive skin and larger breasts, going braless will allow your skin to breathe better and can prevent skin irritation. If you stop wearing a bra your skin health in your chest area may improve, especially if you often experience body or back acne.
Adolescence and early adulthood (12-25 years)
According to research, the average bra size in this age group generally ranges from 32B to 34B. As young women enter adulthood, the size may increase to 34C or even 36C, reflecting the natural development of the body.
The +4 method: take your snug underbust measurement and round to the nearest whole number. Add 4 inches if it's an even number or 5 if it's odd. That's your band size. Subtract it from your standing bust, taken while wearing a bra. That number represents your cup size (1” difference = A, 2” = B, etc.)
“There's no evidence that wearing a bra — or not wearing a bra — while sleeping increases your risk for breast cancer,” she states. “It really comes down to comfort and personal preference.”
The only way to permanently change breast size is through cosmetic surgery, which comes with its own risks (and expense). Doctors usually prefer that girls wait until development is complete before getting surgery.
Any exercise that involves bouncing such as running, aerobics, jumping rope or stair climbing can prove to be a problem when done by women. The high-impact of these workouts can contribute to premature sagging of breasts by stretching out the breasts' ligaments.