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. The design is often seen in t-shirts, sweatshirts, and baseball jerseys. The raglan sleeve was named after Lord Raglan, a British general in the 19th century, who wore a coat with this style after losing an arm in battle. Today, raglan sleeves are appreciated for their relaxed fit and versatility, suitable for various occasions and body types.