Hi Rebekah. I too have been on a mission to find the right bra. If they are too tight they cause agony on the incisions and around the ribs. I have found the M&S sports bra the most comfortable. Before my op I was a 32/34 C, I am now wearing a 36 F sports bra. I was advised on this forum to go up a back size to allow for bruising and swelling.
I tried the Macom Medium, it was FAR to tight. I then tried a 34 DD M&S one, far to tight, then 36E which was okay for a couple of days, but then I must have grown and that bra was agony, so I got 36 F and if feels really comfortable, a massive difference finding a bra that fits comfortably.
ps I had 350 overs.
The bras cost £25, I will find a pic to share so u can see them. xx
good luck with your search to find the perfect bra xx