Purchased this rain jacket for a friend.  He said that the 4x was kind of tight.  He stated that you could only wear a t-shirt under this jacket.  He was expecting the jacket to have more room since he only wears a size 3x.  I purchased 2 rain jackets in size 4x.  I'm not sure if I can return one of the jackets and try to order another larger size.  He likes the style of the jacket and the color.