Missing the size tag but this is size small. Great for work under a blazer. Wore maybe 3 times at most. Covid happened and I gained weight. Been selling a lot of old clothes that used to fit me. I am 5'2 and was 125 pounds at the time for reference :) Calvin Klein Women's Tank Top White Size Small 90% Polyester, 10% Spandex RN# 54163 CA# 57151