without a stitch on

Idioms  

1. Naked, as in They let their baby run around outside without a stitch on. A related phrase is not have a stitch on. These expressions use stitch in the sense of “a piece of clothing,” a usage dating from the early 1800s.

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Example Sentences

“I lived in trees or on my bicycle. The only clothes I liked were old clothes, always the same ones. My mother got so exasperated she would throw them out. So one day to get back at her, I marched out into the garden without a stitch on.”

From Washington Post

Daughter of that descamisado, as my father calls him because he died without a stitch on his back!

From Project Gutenberg