Green’s Dictionary of Slang

mucking-togs n.

a mackintosh.

1840		R. Barham ‘Misadventures at Margate’ in Ingoldsby Legends (1842) 155: A little ‘gallows-looking chap’ [...] With a ‘carpet-swab’ and ‘muckingtogs,’ and a hat turned up with green.
1871		Chelmsford Chron. 6 Oct. 8/2: Even the ‘merry andrews’ wore mackintoshes and other ‘mucking togs’.
1888		‘’Arry on St. Swithin’ in Punch 4 Aug. 49/1: The top-coats and muckingtogs, Charlie, the rugs and the hulsters with ’oods.
1926		(ref. to 1823) Western Dly Press 14 Sept. 4/4: Charles mackintosh invented the water-proof in 1823 [...] the wits christened it the ‘mucking-tog’.