Green’s Dictionary of Slang

(Aus.) to dress oneself up, esp. in a showy, excessive manner; thus flossed up adj.

1941		F. Sargeson ‘That Summer’ in Coll. Stories (1965) 147: It wasn’t until late that I’d had my tea and was all flossied up.
1951		Portland Guardian (Vic.) 26 Nov. 3/4: Slice your cheese and serve it with salad, ‘flossied’ up in a gay coloured bowl.
1966		Aus. Women’s Wkly 28 Dec. 19/3: The programme is simply an interview flossied up [...] into something not as good as it could be.
1977		D. Powis Signs of Crime 184: Flossed up Made attractive by paint and powder – another expression for ‘tarted up’.
1984		L. Leland Kiwi-Yankee Dict. 🌐 all flossied up all tarted up. A nicer way of putting it.
2002		‘Menwith Hill Remembered’ at simons_b.tripod.com 9 Feb. 🌐 A new Col. was making his inital inspection, all flossied up in his best greens.