The type of trousers one wears when walking around one's home wearing nothing but a tee-shirt, are described as newsreader's trousers. This is because some newsreaders, whilst wearing smart jackets and shirts, may have been naked from the waist down whilst appearing behind a television studio newsdesk.
Michael Fish, a once prominent weather presenter on the BBC, was once rumoured to have presented the weather wearing a smart jacket and tie and only a pair of underpants, knowing only his torso was in shot. Hence: Michael Fish once wore newsreader's trousers.
February 05, 2007