A raglan sleeve is a type of sleeve whose distinguishing characteristic is to extend in one piece fully to the collar, leaving a diagonal seam from underarm to collarbone. It is popular in sports- and exercise wear, and named after FitzRoy James Henry Somerset, the 1st Baron Raglan,[1] who is said to have worn this style of coat after the loss of his arm in the Battle of Waterloo. [1] These sleeves are often shorter, usually half- or three quarter-length. A "Raglan Tee" might also be called a "baseball shirt."