a flat double pleat made by folding under the fabric on either side of it
WordReference Random House Unabridged Dictionary of American English © 2025
box′ pleat′,
- Clothinga double pleat, with the material folded under at each side. Also called box′ plait′.
- 1880–85
Collins Concise English Dictionary © HarperCollins Publishers::
'box pleat' also found in these entries (note: many are not synonyms or translations):