O'NEILLUV Sun Protection Women's Basic Skins Long-Sleeve Rashguard Top

Does this have a bra sewn in? If not, are you supposed to wear a bikini top or sports bra underneath?

Will this work for brazilian jiu jitsu? is it skin tight or a bit loose fitting?

I’m size 16 what size should I get

My wife is 5' 2" 153 lbs and 38 C. What size you guys recommend?