noun
gym clothes; gym uniform; PE kit
Refers to the clothes worn for physical education classes or sports activities at school. Often a specific uniform set.
See also: 体操服
明日は体育があるから、体操着を忘れないでね。
We have PE tomorrow, so don't forget your gym clothes.
体操着に着替えてグラウンドに集合して
Please change into your gym uniform and gather on the field.
Compound of 体操 (gymnastics, physical exercise) and 着 (clothing, wear).