Victoria – you asked about sizing…
I took the plunge and got the jacket.
I'm 5'3 and normally wear an XS. The size small UL thermawrap action fits me pretty well. It's a liiiiittle too baggy/not as fitted as I would normally like (and this is apparently their most narrow/fitted style) but works great with layering other jackets underneath, which what I wanted. And I really, really like the powerstretch cuffs with thumbholes. Worth the extra few ounces to me because it's cozy and comfortable.
My friend is 5'3, 125ish (maybe a little less?), chest 33 and owns the UL down inner jacket. She owns a size medium and says the jacket fits just right. Can wear a fleece under it and it's snug, or just a t-shirt and it's just right, not baggy at all.
We both have come to the conclusion that other than the fact that it looks and sounds like we are wearing garbage bags, we love these jackets. And would suggest avoiding ordering it in black.
I have another friend who I believe is ordering the alpine light down jacket who is also your size, so if you are still on the fence I can keep you posted! (I'm not sure what size she ordered.)