Q&A for How to Wear a Bra Properly

It depends on their cup size. There is not one ideal size for a 17 year old.

The bra that's right for you is the one that fits and supports you properly. Measure yourself, or have a store salesperson measure you, before you go bra shopping. When you try on different bras, buy the one that fits you and feels the most comfortable. If you exercise a lot, wear a sports bra.

Yes, anyone can wear a bra if they want to.

It depends. At home, it's often more comfortable not to wear a bra. In public, a bra is generally necessary unless your outfit is incompatible with one, like a strapless dress or low V-neck, or if your clothing has built-in bra cups.