100% silk Little slits on the bottom sides for a flattering fit if not worn tucked in There’s darting (? don’t know what it’s called) - near the armpits that’s super flattering, but one needs to be pressed or steamed down (pictured both sides side by side for comparison). I’m too afraid to take an iron or steamer to silk, but it could be easily remedied. Dry Clean only (and has only ever been cleaned as such). I would say it’s true to size, but meant to have an oversized look - could work for S