伊達だての薄うす着ぎ

expression

wearing light clothes for style; dressing lightly to look fashionable

A set phrase describing someone who wears thin or insufficient clothing in cold weather out of vanity or a desire to appear stylish. Often used critically or humorously.

• 真ま冬ふゆにコートも着きないなんて、伊達だての薄うす着ぎもいいところだ。

  Not even wearing a coat in the middle of winter—that's taking 'fashion over warmth' too far.

• 彼かの女じょは伊達だての薄うす着ぎで、寒さむそうに震ふるえていた。

  She was dressed lightly for the sake of fashion and was shivering in the cold.