A sleeve is a garment that covers the ARM, and there are several types of sleeves. The most common type is the ARM sleeve, which is three letters long and is simply referred to as an ARM. Dolman sleeves are six letters long and are characterized by their loose fit and wide armholes. SHEATH sleeves are also six letters long and are designed to be close-fitting and form-fitting. LINER sleeves are five letters long and are typically made of a thin material that is worn underneath another garment. RAGLAN sleeves are six letters long and feature a diagonal seam that runs from the neckline to the armpit.