tight sleeve; straight sleeve
Refers to a straight, narrow sleeve style on traditional Japanese clothing like kimono, as opposed to wider, flowing sleeves. Often used in contexts of workwear or children's clothing.
This kimono has tight sleeves, so it's easy to move in.
子供の浴衣は筒袖が多い。
Children's yukata often have straight sleeves.
Compound of 筒 (tsutsu, 'tube, cylinder') and 袖 (sode, 'sleeve'), describing a sleeve shaped like a tube.