Have had this surgery, my recommendation isn't necessarily for a specific brand, but rather simple easy to get on and off soft t-shirt type bras that can accommodate your body comfortably. As a previous poster mentioned - don't get the pull on/off type sports bra! Those are hard enough to get on & off on a normal day!!! Front hook if you can find them. Simple back hook if not. Your body is going to go thru so many changes...you won't even "settle" into your new normal size for several months at least.
Get yourself a few front buttom oxford type soft shirts that are easy on & off, too. I think I picked up a few at Old Navy - simple, soft, cheap.
Welcome to the world of being able to buy & wear a shelf bra tank top. Oh - and button up shirts!