Can Not Wearing a Bra Cause Sagging Breasts?

I know the importance of wearing a bra and the joys of taking it off after a long day. I have also heard about how going braless can cause your breasts to sag. So, can

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Does Not Wearing a Bra Cause Breast Sagging?

Have you ever been fitted for a bra to wear with breastforms in a specialized lingerie store? How helpful/pleasant/understanding was the salesperson? - Quora