seamstress (n.)youdaoicibaDictYouDict[seamstress 词源字典]
1640s, with -ess + seamster (also sempster), from Old English seamestre "sewer, tailor, person whose work is sewing," from seam. Originally indicating a woman, but after a while the fem. ending -estre no longer was felt as such and a new one added.[seamstress etymology, seamstress origin, 英语词源]