Definition of "thong"

Because of August he wears shorts and sandals, the Japanese geta sort called thongs.

1963 March 16, Hal Porter, “Little old lady passing by”, in The Bulletin, page 22, column 3

T-shirts, cut-offs, and a pair of thongs (T-shirts, cut-offs, and a pair of thongs).

1964, The Beach Boys, All Summer Long

Players turned up for questioning wearing thongs, shorts and T-shirts.

2006, Peter Murray, David Poole, Grant Jones, Contemporary Issues in Management and Organisational Behaviour, Thomson, page 108

Thongs are the favoured footwear for many Aussies, especially near the beaches, but most people in the Outback find that they can′t put a foot wrong with a tough, nicely worn-in pair or workboots.

2008, Steve Parish, Eccentric Australia‎, page 104

You shouldn′t face condescension if you rock into a boutique in your thongs and a singlet, but neither will you be treated like a princess just because you′ve splashed $5000 on daddy′s credit card.

2009, Charles Rawlings-Way, Sydney, Lonely Planet, page 126