The leather jacket sold for $351,500 and the trousers, which Newton-John famously had to be sewn into, went for $235,500.
Please cop a look at that jacket's extremely plush red satin lining.
The outfit that marked the transition of Newton-John's character in the 1978 musical from demure high schooler to sexy Sandy was among 500 items for sale to help raise money for the performer's cancer treatment center in Australia.
And yeah, everything went for WAY over its estimated value.
An unnamed buyer on Saturday shelled out $243,200 for the jacket and $162,500 for the trousers made famous by the four-time Grammy Award-winning actress in the hit film's "You're the One that I Want", finale.
Quick question: who are these people?
And a Pink Ladies jacket that the cast gave to Newton-John as a gift brought in $50,000, which Reuters said was 25 times more than expected.
While the winners prefer to stay under the radar, Aussie Newton-John tried to tempt model Gigi Hadid to buy the ensemble.
For instance, a poster for the film that was signed by cast members including Newton-John and Travolta was expected to sell for $1,000 and instead went for $64,000, according to Reuters.
The pink gown she wore to the film's premiere sold for $18,750, Julien's Auctions confirmed - three times the estimate.
The British-born, Australian-raised 71-year-old singer and actress revealed earlier this year that she was battling breast cancer for a third time since first being diagnosed in 1992.
All the proceeds from the "Grease" jacket and pants will benefit the centre, as well as a portion of all the other items sold yesterday.