My honest first impression on buying the viral Aritzia puffer jacket, freaking obsessed! I got an XS, I would S if you want to be able to wear really really thick layers. But I can def wear a knitted sweater or sweatshirt under the XS! I’m 5’1, 109lbs, 34B and have broad shoulders. LTKSeasonal LTKStyleTip LTKWatchNow