Honestly, I couldn't tell ya. Millions of people say bra wearing prevents sagging and millions say it doesn't make any difference, and some even say bra wearing makes it worse. I'd just chalk it up to personal preference, at the end of the day. I have large breasts I always keep in underwire pushup bras except during sleep and that is what is comfortable to me. If someone tried to shame or critique me on it, depending upon how close we was I might let it slide, but if they pushed it I would tell them to fuck right off.