JKC wrote a review of Arc'teryx Cerium LT Down Vest - Women's on July 9, 2014
Familiarity: I returned this product before using it
Fit: Runs small
This vest is well made, and looks great, but unfortunately it didn't fit me. I have several Arcteryx jackets, a thin vest, and a couple of their tops, all in size small. So I ordered the vest in the same size, but it was too small through the chest. I'm 5'4", 105lbs., and a 32A. Proportionately my hips are slightly bigger than than my chest. The vest fit very snugly through the chest over just a t-shirt, and was tight over a mid-weight fleece, yet it fit through the hips. If you're about my size and like a snug fit, this may work for you, but if you're bigger than an A or B-cup and my size, I doubt you'll be able to zip it up unless you go to a bigger size. I would have tried a medium, but there is no drawstring around the bottom, so I figured it would be too big around the hips. I'm still giving it 4-stars, because it is super nice, if it would fit.