Olivia Newton-john - Olivia Newton-john To Sell Grease Outfit For Charity

The singer/actress had to be sewn into the black trousers for the 1978 film's finale and she took them home with her after the shoot wrapped.

Newton-John has kept them locked away for more than 30 years, only bringing them out to show Oprah Winfrey during an appearance on her talk show in 2011.

However, she is now hoping to offer them up for an auction to benefit a new wellness facility for cancer suffers at the Austin Hospital in Melbourne, Australia.

She tells Fox411, "They're in a closet. Oprah had them on the show because she asked me to bring them, that's the only time they've been out. One day I'm going to sell them for my cancer and wellness centre, I'm going to auction them off... They were made in the '50s and we made the movie in the late '70s so they were already 25 years old when I wore them."

Newton-John is also hoping to raise money for the clinic with her cookbook of healthy recipes called Livewise: Easy Recipes for a Healthy, Happy Life.

She adds, "I needed to raise money for the wellness centre that I'm building... The wellness centre opens next month. It's taken nearly 10 years. It was my dream to have it as part of the hospital so when people are going through their cancer treatments they can get support from the wellness centre on the grounds of the hospital. There will be yoga classes, cooking classes, massage therapy, acupuncture, things that are going to help them through their cancer and their families."