Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
Don't know about the fitting as it's not mine. I bought it for a friend and I didn't give it to him yet. But found colour fantastic and quality perfect 👌hope so it will fit him 👍😊 I would like to prefer it if somebody wants sweatshirt of grey.