Garish, gawdy, with lace or staring and discordant colours: a term said to be derived from the shrine and altar of St. Audrey (an Isle of Ely saintess), which for finery exceeded all others thereabouts, so as to become proverbial; whence any fine dressed man or woman said to be all St Audrey, and by contraction, all tawdry.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Taw * TawedNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes