I used m&s zipup for the first 5 days as my macom just wouldnt fit with the swelling. I went up a back size too. Its now to big so love my macom now its so hard to judge. Ive ended up buying two different sized macoms through my 4 weeks since op too. I started day 5 in a small macom then around 2 weeks it became slack so now wearing xs. Personally i everyones comfortable in different styles . Best of luck ?