keep your shirt on
US /kiːp jʊər ʃɜːrt ɑːn/
UK /kiːp jʊər ʃɜːrt ɑːn/

1.
落ち着いて, 怒らないで
to tell someone to calm down or not to get angry
:
•
Just keep your shirt on, we'll get there eventually.
落ち着いて、最終的にはそこにたどり着くから。
•
Hey, keep your shirt on! There's no need to yell.
おい、落ち着いて!叫ぶ必要はないよ。