This is my third winter in Boston and I needed a very warm coat (I'm from Italy and I'm always cold here). They told me that this parka is the best..and it's absolutely true! The best purchase ever! I can walk and wait for the bus when it feels like -4 degrees (-20 Celsius), since this coat is windproof, waterproof, and very very warm. With the hood my ears and head are protected from the chilly wind.
I'm 5.3ft, 119lbs. I found the "View Sizing Chart" very useful. However, before ordering on line I tried XS and S at the store: the S was too big for my shoulders. At the end I got a XS and the parka fits a little tight on my chest only when I need to wear a sweater plus a fleece jacket. But it's still ok.
It's a great investment! Highly recommended!