The size is listed as "9AR". This is a standard size, for a standard build, so I've listed it as a size M. I, who usually wear a size L, was able to wear it without any problems. It has been washed, so the stains are not from underarm sweat, but there are stains under both arms. I believe this is due to storage as it has been some time, but please refrain from purchasing if you are concerned. There are also stains on the chest. (Photos 5, 6, and 7) Please consider this item with the understanding that it is a used item. Color: Blue Skirt Length: Knee-length Sleeve Length: Sleeveless Skirt Silhouette: Flare