I’ve got one from Asda, it does up at the back. I had it in a 34E, but this just felt so tight round the bottom, so yesterday I got a 36E and it still feels like there’s so much pressure round the bottom band, pushing on where my incisions are (which I’ve got plasters on so it’s not rubbing on them directly). I’ve got a front fastening one but that’s only a 34DD but I might try it on to see if fits a bit different round the bottom.