shirtyoudaoicibaDictYouDict[shirt 词源字典]
shirt: [OE] A shirt, like a skirt, is etymologically a ‘short’ garment, one that stops at or just below the waist rather than reaching down to the knees or beyond. In common with Swedish skjorta and Danish skjorte, it comes from the prehistoric base *skurt-, source of English short. Shirty ‘angry’ [19] was inspired by the now defunct expression get one’s shirt out ‘lose one’s temper’ (the opposite keep one’s shirt on ‘remain calm’ survives).
=> share, shear, short, skirt[shirt etymology, shirt origin, 英语词源]
shirt (n.)youdaoicibaDictYouDict
Old English scyrte "skirt, tunic," from Proto-Germanic *skurtjon "a short garment" (cognates: Old Norse skyrta, Swedish skjorta "skirt, kirtle;" Middle Dutch scorte, Dutch schort "apron;" Middle High German schurz, German Schurz "apron"), related to Old English scort, sceort "short," from PIE *(s)ker- (1) "to cut" (see shear (v.)).

Formerly of the chief garment worn by both sexes, but in modern use long only of that for men; in reference to women's tops, reintroduced 1896. Bloody shirt, exposed as a symbol of outrage, is attested from 1580s. To give (someone) the shirt off one's back is from 1771. To lose one's shirt "suffer total financial loss" is from 1935. To keep one's shirt on "be patient" (1904) is from the notion of (not) stripping down for a fight.