not have a stitch of clothes (one)
To be totally nude; to not have any clothing on whatsoever. My roommate didn't have a stitch of clothes on as I walked into the kitchen. I nearly dropped my mug of tea! The group of ten or so students didn't have a stitch of clothes between them as they streaked onto the field during the halftime performance.
not have a stitch of clothes (on)
Fig. naked. He walked through the house and didn't have a stitch of clothes on.