@Moobdood,
BO is Bovine Ovary, it's a powerful supplement for those of us who are trying to feminize with or without prescribed estrogen treatments. 

I am jost on BO and Petuitary Glandular along with some other vitamins to help. Hello DiDi on estrogen under a doctor's care and is using BO as a supplement and says it's really helping. I must agree,  she's quite lovely  . 

I understand about the bra, I like them, my wife hates them, but she is ok with the ones I got her after taking her in for a bra fitting. But I think no amount of fittings will help if it is the constraint of it, you could try t shirt bras or abralette, they are a little looser fitting and provide support.