Clothing. I’ll unrig the bloss; I’ll strip the wench. Rum Rigging; fine clothes. The cull has rum rigging, let’s ding him and mill him, and pike; the fellow has good clothes, let’s knock him down, rob him, and scour off, i.e. run away.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
See also the definition in Nathan Bailey's 1736 dictionary of canting and thieving slang.
Rig * RightNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes