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Definition of Jac shirt
1. Noun. A heavy shirt, which is often worn in place of a jacket during the Fall or the Spring seasons. The name originates from "jacket" and "shirt". A jac shirt may have buttons or a zippered front. A jac shirt usually has two breast pockets and may have front hand pockets as well. Jac shirts are usually worn indoors and outdoors alike. ¹
¹ Source: wiktionary.com