Green’s Dictionary of Slang

a renovated hat, ironed and greased back to something resembling its original condition; note v. use in cit. 1863; cit. 1889 is prob. mis-defined.

1863		G.A. Sala Breakfast in Bed 105: ’Tis like an old hat that has been ‘molokered’, or ironed and greased into a simulacrum of its pristine freshness.
1889–90		Barrère & Leland Dict. of Sl., Jargon and Cant II 60/1: Molocher (popular) a cheap hat.
1892		Westminster Gazette 4 Aug. 3: Molocker, it appears, is the trade term for renovated old chapeaux [F&H].
1914		Dundee Courier 3 Mar. 8/1: The Hat in Slang [...] A by no means exhaustive list would include ‘tile,’ ‘golgotha,’ ‘canister,’ ‘castor,’ ‘chimney,’ ‘colleger,’ ‘cock and pinch,’ ‘cowshooters,’ ‘david,’ ‘digger’s delight,’ ‘fantail,’ ‘gomer,’ ‘goss,’ ‘moab,’ ‘molocher,’ ‘muffin,’ ‘mushroom,’ ‘pill biox,’ ‘stove pipe,’ ‘thatch,’ ‘truck,’ and ‘wee jee’.
1914		Dundee Courier 3 Mar. 8/1: The Hat in Slang [...] A by no means exhaustive list would include ‘tile,’ ‘golgotha,’ ‘canister,’ ‘castor,’ ‘chimney,’ ‘colleger,’ ‘cock and pinch,’ ‘cowshooters,’ ‘david,’ ‘digger’s delight,’ ‘fantail,’ ‘gomer,’ ‘goss,’ ‘moab,’ ‘molocher,’ ‘muffin cap,’ ‘mushroom,’ ‘pill box,’ ‘stove pipe,’ ‘thatch,’ ‘truck,’ and ‘wee jee’.
1984		Partridge DSUE (8th edn) 747/1: molo(c)ker, A renovated hat.