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 shrug is a gesture that is performed by lifting both shoulders up, and is an indication of an individual either not knowing an answer to a question, or not caring about a result.
It can also be used when someone is simply ignoring the person's question. It may be accentuated with raised eyebrows and/or an exaggerated frown. It is very common in Western culture, rather than saying "I don't know", they would simply perform a shrug. In the English-speaking world it may be accompanied by a three syllable grunt or hummed mumble mimicking the intonation of "I dunno". The shrug is relatively absent from Eastern culture.
The gesture may be accompanied by raised palms.