This jacket is amazing! i at first bought the medium because that is what i usually wear on top. when it arrived in the mail i put it on asap. it fit but was definitely too form fitting to wear a sweater or long sleeve shirt underneath. so i called the store and asked them to reserve a large and that one fit perfectly! it's loose enough to wear something underneath but not so loose that it looks to big. it is so soft and cozy, and the hood is my favorite part!