I like a nice tight fitting sports bra. It will prevent too much movement but will give you the support you need.
There is no "best" bra size.
by working out and eating properly, or maybe you are just wearing a bra that is to tight.
Sports bra
Look for a demi bra - with or without padding.
For most formal events your best option for a bra would be a convertible bra, it comes with adjustable straps to fit almost any dress.
alot bra
It is best to get a full coverage bra with wider straps and at least 4 closures in the back.
You should look for a push up bra or a bra that has a thin coverage to prevent lines under clothes.
Big Ones
The best bra for a halter or strapless dress would be a convertible bra or a strapless bra. Try the Vanity Fair convertible bra which allows you to choose how you want to wear your straps!
34 b is the average bra size in the us 36 is the best looking size
Aerie! Paige is my favorite at the moment.