I LOVE this jacket!! (I am 5'9 122 lbs. size 3-7 depending on the brand (33, 26, 34)). I bought the tan one first (have since washed it at least 4 times and it is holding up BEAUTIFULLY) and found it to fit me like a large; it was so soft, thick, and comfy that I bought the grey color as well and it is made of  the same thick butter soft sweatshirt fleece as the tan, and fits like a medium. The style is boxy rather than fitted and the waist hits me just below my hip bones. I just wish they made them in more colors!!  