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An invisible cardigan worn by a lady over her tshirt/ blouse when walking home on a freezing night out, which stops her from feeling the cold.

The male version being, of course, the beer jacket
MAN: "It is jolly cold this evening. Would you like to borrow my jacket?"

WOMAN: "No thank you kind sir, I have my Barcardigan on."
by Its not all bad news February 13, 2009
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