I wear at 36DD, so I understand your concern. Keep in mind that for the first month or so you won't be up for doing anything. Since I was just laying around the house, I didn't wear a bra. I have had OHS 3 times, so I have learned some tips each time. I bought some non-underwire bra's that connect in the back. Of course, the support wasn't perfect, but it was better than nothing. I bought a couple 38's for the first few months so that it was a little loose. I didnt want anything rubbing against the incision. As the swelling went down, I moved to the 36's. By the time I was ready to go back to work (12 weeks) I could wear my regular bra's again without the underwire bothering me. I found the bra's at Walmart.
Good luck....you'll be back in a regular bra in no time.....
.........Rachel