Definition of "dut"

The result is that I’m entering Ward Jackson Park, near Hartlepool Cricket Club, dressed in people shorts, comfy top – and traditional blue-and-white Pooly dut (for culture starved southerners, a woolly cap).

2010, Alan Wright, Wright Here

There was a kid at our school called Dean Smith who used to wear a 'Benny Dut' to demonstrate how unfathomably stupid he is.

1986, Luke Davis, How to talk proper