古ふるい革かわ袋ぶくろに新あたらしい酒さけを盛もる

expression, godan verb (-ru)

pour new wine into old wineskins; give something unorthodox an orthodox presentation

A biblical idiom used metaphorically to describe presenting new or unconventional ideas in a traditional or rigid framework, often implying a mismatch.

• 彼かれの革かく新しん的てきな理り論ろんを古ふるい学がく説せつの枠わく組ぐみで説せつ明めいするのは、古ふるい革かわ袋ぶくろに新あたらしい酒さけを盛もるようなものだ。

  Explaining his innovative theory within the framework of old doctrines is like pouring new wine into old wineskins.