Yiddish: It's as suitable as an arbe-kanfes on a dog.

SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten. An arbe-kanfes (also known as a tallit-katan) is an undergarment worn by strictly observant Jewish men. It is constructed like a poncho—a fabric rectangle with a hole for the head—and ritual tassels (tzitzit) hang from its four corners.

עס פּאַסט ווי דעם הונט אַן אַרבע–כּנפֿות.

Es past vi dem hunt an arbe kanfes.

It's as suitable as an arbe-kanfes on a dog.