Green’s Dictionary of Slang

(Aus.) flashily dressed; also in fig. use, see cite 1929.

1929		Eve. News (Rockhampton, Qld) 2 Nov. 8/3: The School Gets ‘Laired Up.’ [...] Our school has just been lined and repainted. It has not been painted since it was built, and that was in 1913.
1935		Albury Banner (NSW) 30 Aug. 30/2: Yer jus’ ort ‘ave seen the girl Roddy las’ Saturdee night at the pitchers, all laired up, and the guy, swot me, a regular Lord Muck.
1938		Dly Examiner (Grafton, NSW) 5 Feb. 7/5: Among the Australian proletariat, ‘lairy,’ ‘lairing up,’ and other improvisations upon the verb 'to lair' have been current for a number of years.
1941		Baker Popular Dict. of Aus. Sl.
1945		Baker Aus. Lang.
1962		S. Gore Down the Golden Mile 64: He climbs out of the cockpit, all laired up in this red rig-out and whiskers.
1968		S. Gore Holy Smoke 46: They come all laired-up in their best togs like a dog’s dinner.