without a stitch on
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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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.