EUC Under Armour Black & Silver Full Zip Sherpa Lined Jacket-Women's Sz Small???

Keep warm in the sherpa lined Storm jacket by Under Armour. The outside is a black and silver knit with a black sherpa lining. It has 2 pockets on the front along with a collar and full zip. It also has seaming details There are no tags but my guess is that the outside is a cotton/poly blend. Also no size tags. I am a medium and it is tight on me so I am guessing it might be a small. Here are the approximate measurements...pit to pit is 19" and length is 24.5". Excellent used condition.