Search pals breast forms. (people sell them on fleebay) Very comfortable and unlike most they aren't wrapped in a nasty feeling plastic bag that you sweat like crazy under. Plus they are very reasonably priced. I still use some smaller of these given I don't have real breasts the size I would like to fit my frame. I'm somewhere between a 34AA and a 34A right now and 34B is where I want to end up. I wouldn't recommend HUGE boobs as they clearly will draw attention 😛 But super flat chested looks just as odd IMHO.
The hardest part for me was the same thing genetic women go through, finding a bra that fits, looks good and is comfortable.