It really depends on how comfortable you are with a fuller fit. I quite like bumping it up by about 1" in mid and chest, .25" in sleeve. It's still not as easy to take off as a t-shirt or anything, but like this balance in terms of slimness vs functionality. Also--the length is something people don't consider that much. If you're going to wear untucked or half tucked you'll want to go shorter in the body--I go 1" shorter in the body for popover untucked than regular shirt untucked. I might need to revisit that this summer, though, can't remember if it's spot on or not.