The arm holes aren't uncomfortable or anything, they're just tighter than I'm used to with a jacket. Same with the chest area. I don't think I actually have any jackets right now with really high arm holes to be honest, but as I put it on more and more, I definitely am getting a lot more used to it.It's definitely a bigger purchase, so I just wanted to make sure. I'm definitely going to hang on to the size 48 then I think. Cheers everyone for all of your input!!!