training bra

Noun

A type of bra used by girls, usually teenage girls when their busts are still small.

Japanese Meaning

胸が十分に発達していない若い少女（通常は思春期の少女）が、胸の成長段階で使用する下着、すなわちトレーニングブラ。

My younger sister felt nervous about wearing her training bra to school, but her friends were supportive.

妹は学校に初めてのブラを着けていくのが不安でしたが、友達が励ましてくれました。

Sense（1）

A type of bra used by girls, usually teenage girls when their busts are still small.

training bras

（ plural ）