The black leather jacket and skin-tight trousers that Olivia Newton-John wore for the finale of Grease have fetched $405,700 (£314,000) at auction – more than double the expected bid.
The actress’ original script from the film was also among the items at the sale in Beverly Hills, California, which in total raised $2.4m.
Some of the proceeds will go towards Newton-John’s cancer treatment centre in Australia.
The buyers’ identities are not public.
Grease was released in 1978 and Olivia Newton-John played demure Sandy alongside John Travolta as bad boy Danny.
The infamous black outfit marked Sandy’s transition from a good girl high-schooler to a sexy, leather-clad biker chick, when the couple sang You’re the One That I Want in a fairground.
The leather trousers were already two decades old when she wore them and had a broken zip that meant Newton-John had to be sewn into them.
She said that “limited” what she could eat and drink while filming, adding “those were long days”.
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The pink gown she wore to the film’s premiere sold for $18,750, Julien’s Auctions confirmed – three times the estimate.
Newton-John has asked buyers to send her photos of themselves with the items along with a personal note.
She said selling a large amount of her possessions was a “simplification of my life”.
Aged 71, the British born Australian actor is currently undergoing treatment for stage four breast cancer.
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She was previously diagnosed with the disease in 1992 and 2013 and has opened up about using medicinal marijuana along with other natural remedies for the disease.