Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I am 5’4 (162cm) , 105 lbs and usually wear a size XS/ 0 in clothing . The S size in this jacket fit perfectly except the sleeves were slightly long . I wear my jackets with rolled up sleeve anyway so it didn’t matter . I have very slim arms so this fit perfectly- fits like my other XS jackets. Great colour , goes well with dresses. Arms are slim fitting so it would be too uncomfortable to layer anything beyond a thin T shirt layer under this jacket. Material is a soft stretchy denim .
I went up a size to accomodate my bust, it seems to have worked out well as the jacket fits well without being tight across the chest. I may get the waist tailored to fit a bit more snug. The jacket itself is a thin stretchy denim, comfortable and flattering.