sark (n.) Look up sark at Dictionary.com
"shirt," late Old English serc, surviving as a Scottish and northern dialect word, from Old Norse serkr, cognate with Old English serk (see berserk). Gordon lists it as a loan-word from Latin sarcia; other sources are silent on the point. Cf. also Lithuanian sarkas "shirt," Old Church Slavonic sraka "tunic," Russian soročka, Finnish sarkki "shirt," which perhaps are from Germanic.