Green’s Dictionary of Slang

combinations, i.e. a man’s woman’s or child’s garment consisting of combined chemise or undershirt and drawers.

1918		F. Dunham diary 12 Aug. Long Carry (1970) 200: I always think of long, woollen ‘combs’.
1995		A. Higgins Donkey’s Years 48: Country braces or what he called galluses and, tucked into the long-johns (combs.), a labouring man’s collarless cotton shirt known as Grandfather.
1930		letter in M.P. Jackson Suitable for the Wilds (2006) 159: The sweater and long-legged wool combs. you sent probably saved me from very severe frost bite on Wednesday.
2010		V. McDermid Place of Execution : He wore a set of woollen combs that might once have been white but were now the color of dried snot.
2012		(con. late 1920s) L.M. Arnold My Short Century 30: My daily outfit consisted of woollen ‘combs’ and a ‘peter pan bodice’, with home-made navy-blue knickers and either a blouse or woollen jumper.