ttwrote a review of Marmot Chelsea Down Coat - Women's on December 6, 2011
Based on numerous reviews of the coat running small I ordered a size up only to find the coat too large when i finally received it. I'm 5'5", 118lbs...measurements are 33/25/35. I usually wear a size 2 or Small. I have broad shoulders and long arms so I opted for a M to accommodate for this and winter layering. The M was huge even with my thickest hooded sweatshirt on underneath. I've returned the M and am waiting for the S to arrive. I think this coat runs fairly true to size...at least for me it did.
I can't comment on the warmth of the coat as I didn't wear the coat outdoors but I will say the coat is very lightweight and thin. So if this coat delivers and keeps you warm and looking sleek then thumbs up.