I bought this sports bra to use as a post op bra and it has worked out perfect. I am normally a size small and they say go up one size so I bought a medium. The day after surgery I couldn't fit into it. Lucky I had bought a bigger less quality brand from Walmart. I asks my dr about this, should I order bigger size, and he said that  its just from swelling and I should fit into them. (im 500cc ultra high profile so i was concerned)Sure enough the 3rd day I was able to fit into these mediums I bought. I ordered some more, 10 altogether.  They are super comfortable and supportive so I have no problem wearing 24/7  which is good because I have to wear them for 6 weeks. So if u go super busty you might not be able to wear one the very next day after bandages come off but the day after that you should be just fine.