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A shrug is a cropped, cardigan-like garment with short or long sleeves, typically knitted. Generally, a shrug covers less of the body than a vest would, but it is more tailored than a shawl. Shrugs are typically worn as the outermost layer of an outfit, with a full shirt, tank top, or dress beneath.
A shrug covers a small portion of the upper body. Some shrugs are tied together just below the bustline. Another style is cut off at the sides and thus little more than a pair of sleeves joined at the back.
A bolero jacket or bolero is a more formal garment of similar construction, essentially a short tailored jacket.
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