J. Crew Jackie Cardigan in gray. The material tag has been cut out, but feels like a polyester, silk blend. It's a heavy Cardigan, but silky. The size tag has been cut out, but I'm a size 2-4 and this fits me. So, I would say it's a size S. measurements: underarm to underarm 19". Sleeve length 26". Shoulder to bottom 21". (Main image is a similar style, the one selling has long sleeves)