I'm an XS petite in women's (5'4" and 110lbs) and and this jacket was perfectly true to size and had room for two layers underneath for skiing.  It doesn't look poufy and while slightly boxy, overall it's still an attractive ski jacket that I didn't mind wearing off the slopes too.  I never bothered to detach the inner jacket from the outer one but it's nice to have the option.  There were side pockets and an inner pocket which kept my phone dry on the mountain.  Highly recommended.