一いっ張ちょう羅ら

noun

one's best clothes; one's only good outfit; Sunday best

Refers to the one special outfit a person owns for important occasions, often implying it is the only presentable set of clothes. Can be used humorously or self-deprecatingly.

• 同どう窓そう会かいに一いっ張ちょう羅らのスーツを着きて行いった。

  I wore my best suit to the class reunion.

• 彼かれの一いっ張ちょう羅らは、就しゅう職しょく活かつ動どうのときに買かったリクルートスーツだけだ。

  His only good clothes are the recruit suit he bought for job hunting.