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I love this zip up!!! I love it so much, I bought it in two colors. You can feel the quality difference compared to The North Face Glacier 1/4 zip. It's thicker and the seams are noticeably better compared to The North Face's fleece. The only thing is that I wish it was more fitted, but it's so comfortable and warm, I don't really care.
In terms of sizing, I ordered the XS and I'm 5'1" and 120lbs. I could probably gain 30 lbs and still fit in this since it's not fitted (hopefully that won't happen though).