They do normally say get a band width bigger but I didn’t swell and needed a 34 like I always am so I would get atleast two, one a 34e and one a 36e. Or whatever you are normally I’m just assuming you are a 34, and then take the one you don’t use back, that’s what I did.
Also there are lots of reviews on here about macom bras but I can say hand on heart in. Te first few weeks that it was the most comfiest as it doesn’t sit on your scars and also stretches to the cup size you are xx