I usually wear a large one. I wear averages in these tailored Carhartt shirts with no shirt underneath. I have a lot of short and long sleeves. The poly/cotton blend colors are my favorites. Pure cotton fade (still like it). My bust is 43-44 inches, I wear jeans with a 34 inch waist. Plus size is messy, especially when you wear them as a first layer with a flannel or denim jacket over them.