96% Rayon 4% Spandex (contrast fabric is 92% Polyester 8% Spandex). 96% Rayon 4% Spandex. Measurements: Laying flat, underarm to underarm measurement: 16" Small, 16.5" Medium, and 17.5" Large. Length from the very top of shoulder to the very bottom of the hem is 32.5" Small, 34" Medium, and 35.5" Large. Fabric has a couple inches of give. No trades. No trades.