The lack of sleeves on a garment worn the upper body, often revealing bare shoulders and arms.
On pixiv, the tag アメリカンスリーブ (American Sleeve) is used to denote a kind of sleeveless clothing where the armholes are cut near the base of the neck to the lower armpit, leaving a large portion of the shoulders bare. This is also typically a sleeveless turtleneck.
The following tags are aliased to this tag: no_sleeves (learn more).
The following tags implicate this tag: sleeveless_jacket, sleeveless_turtleneck, sleeveless_dress, sleeveless_shirt, sleeveless_hoodie, and sleeveless_kimono (learn more).