Word Origin & History
1835, "lady's loose robe," from Fr. peignoir, from M.Fr. peignouoir "garment worn over the shoulders while combing the hair" (16c.), from peigner "to comb," from L. pectinare, from pecten (gen. pectinis) "a comb," related to pectere "to comb." A gown put on while coming from the bath; misapplied in Eng.
to a woman's morning gown.