I was a 34b and recently had 380 implants. What size bra should I be?

Bra cup size is not a medically derived measurement. It is a bra manufacturers term. Therefore your only measurement should be how much you love your breasts. In one brand you may be a C cup, another you may be a D and one of the most popular brand you may even be a DD. It also depends on the projection and how that fits in that brands cup shape. My guess would be a big C or D. Don't get stuck on the size of the bra. You don't walk around with the tag sticking out. Most important is do you like how you look. 

Breast implant size cannot be accurately estimated into a particular cup. However, I think your plastic surgeon should have prepared you for what to expect. I would guess you will either be a C or D cup. Best wishes, Dr. ALDO