Textured waffle-knit fabric with an oversized, fluid drape through the body that gives the batwing sleeves their volume, tapering to a snug rib cuff at the wrist. Machine wash cold inside out on a gentle cycle, and avoid the tumble dryer — heat flattens the waffle texture permanently and it won't puff back up once it's pressed flat. Reshape the neckline and hem while still damp, laying the top flat rather than hanging it, so the off-shoulder edge and side slits don't stretch out of position. With gentle care the waffle texture holds its dimension wash after wash; the main thing to watch is over-stretching the loose weave when pulling it on.