Which dimensions are you worried about? Chest/shoulders/armholes look great imho. You could stand to loose a little in length but not much. It looks a little stiff as it's new so absolutely soak and wear it like a boss
length will shrink somewhat, so that's not a problem… P2P and arm opening could be snugger, undecided how much they will / could shrink... on the other end shoulders are fine and might be too small on a Small....