Green’s Dictionary of Slang

a tracksuit; also attrib; thus trackied up, wearing a tracksuit, trackie da(c)ks, tracksuit trousers.

1995		Woroni (Canberri) 25 May 22/4: Chooka distinguished himself by running up on stage, dropping the tracky-dacks and waggling the wedding tackle.
1998		A. Warner Sopranos 59: If she didn’t wear tracky botoms the boys would gawp terrible at arse [...] and tits.
1999		Guardian Rev. 27 Aug. 19: Disguised as a local poet in my Afghan coat and ‘trackie bottoms.’.
2001		K. Sampson Outlaws (ms.) 47: I gets my trackies on and we get mobile, pronto.
2004		T. Winton ‘Long, Clear View’ in Turning (2005) 197: Pasty blokes in [...] tracky dacks.
2004		L. Redhead Peepshow [ebook] We sat in my lounge room in our PJs. Mine were a pair of old trackie daks and a singlet.
2007		S. Maloney Sucked In 267: I changed into [...] trakkie daks and a sloppy joe.
2010		L. Redhead Thrill City [ebook] No trackie-daks either, we’ll have to go corporate on this one.
2012		D. O’Donnell Locked Ward (2013) 183: Dressed only in trackie bottoms, Allie shuffled off to the khazi.
2015		L. McInerney Glorious Heresies 122: I’m wearing trackies.
2018		G. Gilmore Class Act [ebook] Davie told Murdoch he’d get the T-shirt and tracky daks back to him the next day.
2020		G. Armstrong Young Team 7: Always git a Lacoste tracky on [ibid.] 38: A’m in, changed n trackied up n ready tae join the perty.