Green’s Dictionary of Slang

trousers; usu. Rowtons.

1905		E.W. Hornung A Thief in the Night (1992) 310: What with these new Rowton Houses, my beard, and my otherwise well-spent holiday, I hope to have quite a good autumn season before the erratic Raffles turns up in town.
1976		(ref. to 1950) R. Barnes Coronation Cups and Jam Jars 167: Sod it, I’ve torn me Rowton Houses.