Word Origin & History
1586, muphtie "official head of the state religion in Turkey," from Ar. mufti "judge," active participle of afta "to give," conjugated form of fata "he gave a (legal) decision." Sense of "ordinary clothes (not in uniform)" is from 1816, perhaps from mufti's costume of robes and slippers in stage plays,
which was felt to resemble plain clothes.