I ordered this in XS and it fit great in the waist, but the chest area was much too big. I am average size and couldn't fill all the fabric. Not sure what happened with the cut on this one. Loved the green color and I'm disappointed I'll have to send it back.
Very warm and comfortable vest, not bulky at all!!! Quite satisfied with the fit (pretty true to size, although it is "fitted"). I have put my winter coat away and now use this vest over a hoody or a medium weight zip-up jacket. Very satisfied overall with this product.