I'm sorry this is a little wrinkly, I can't find my steamer! This is an authentic "marinière" shirt, bought in Normandy (Arromanches), France. The brand is a French brand, Week End à la Mer Didn't try it on when I bought it... and it didn't fit :( T6 (French sizing) is about an XL in the US; measurements are: 24" long, 42" bust, and sleeves are 18.5" long (3/4 length) 100% cotton