I did end up sizing up on this jacket to wear over a warm jacket, and I was so disappointed to find out that this jacket runs small. I am keeping it because I live in Texas and it is rare that it's cold enough to wear 2 jackets. So this jacket fits fine without having a hoodie or jacket under it. I will say that the construction of the jacket is incredible, and it kept me very dry all weekend through the torrential downpours. Despite the sizing, it's an excellent jacket!