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Runs very small; I'm 5'5", 125 lbs, ordered extra large and it barely fits. However, price is right and it's a good layering piece since the fit is slim, it'll be fine under a sweatshirt or equivalent.
Bought this for my wife, and she did not like it at all. Very ruff, scratchy feeling to it. Extremely thin material. Much smaller than expected. She wears mediums in pretty much everything, but this medium felt like a small on her.