noun
school swimsuit; regulation school swimsuit
Refers to the standard one-piece swimsuit, often dark blue, worn by students during school swimming classes or events in Japan.
小学校のとき、スクール水着を着てプールに入った。
In elementary school, I wore a school swimsuit and went into the pool.
スクール水着はたいてい紺色
School swimsuits are usually navy blue and have a place to write your name.