To measure your waist, find the narrowest part of your stomach. The hip circumference is exactly at the widest part of your upper body. When you measure these measurements, it may be tight against the body, but not too hard on the tape measure (it can stretch!).

Of course not. Everyone is put together differently. So if you need an XL for your bottom and an S for your top, this is certainly possible.

The firmness of bras is not in the underwire. How could it be, it's an iron half moon that sits under your chest. Underwire is only to give shape to your chest. Firmness is in the elastics and the fabric. If you have larger breasts, it can be certain that one bralette may not be suitable because of the fabric, but another is. Be sure to come by to try on, then you'll know for sure!