Yes, most females wear bras to hold their boobs.
However, girls with no tits at all still wear bras. Unless you actually have boobs which would flop around, no bra is needed. Yet, they wear them anyways.
Meanwhile, men with large man boobs don't wear a bra...even though it was designed to hold boobs.
Why is this?
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Because nipples. Most women don't want their boobs and nipples showing through their shirts.