rarant shirt women's 11R measures as a M great shape

rarant shirt women's 11R measures as a M great shape. This shirt has a built in undershirt that is a cotton type fabric and measures 17.5 inches across lying flat from armpit to armpit. The outer layer is a chemise type fabric that is thin and cool. The shirt measures 25 inches in length from the back of the neck to the bottom of the shirt.