Raglan sleeves are a type of sleeve design that extends in one piece from the collar to the underarm, creating a diagonal seam. This style allows for greater arm movement and comfort, making it popular in casual and athletic wear. Typically found in t-shirts, sweaters, and jackets, raglan sleeves can be made from various fabrics. They are often characterized by their relaxed fit and are commonly seen in both men's and women's clothing. The design can also add a sporty aesthetic to garments, making them versatile for different occasions.