A raglan sleeve is a sleeve that extends in one piece fully to the collar, leaving a diagonal seam from underarm to collarbone.[1] The ancient Chiton was a tunic worn by men and women of ancient Greece and Rome that fastened at the shoulder resembling a raglan sleeve with a peplum waist line.
It is named after FitzRoy Somerset, 1st Baron Raglan,[2] who is said to have worn a coat with this style of sleeve after the loss of his arm in the Battle of Waterloo.[2]
The raglan mid-length sleeve is a popular undergarment (worn under the jersey) for baseball teams in MLB.[3]
Another item whose name appeared at the time was the raglan, a type of overcoat named after Lord Raglan, a British general in the Crimea. The garment was unusual in that the sleeves continued in one piece up to the neck, producing a larger, looser armhole that suited the one-armed general.
The raglan sleeve provides mobility and flexibility in the arm and shoulder and has remained popular in baseball jerseys.