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Rose Byrne at the 18th Annual Screen Actors Guild Awards in LA. Picture: Dimitrios Kambouris/WireImage

Australian actress Rose Byrne fell in love with jumpsuits after buying a "really disgusting" one at a flea market.

The Bridesmaids star has chosen to wear all-in-one pieces to industry events in the past and has explained how her love affair with pantsuits was born.

Byrne's first jumpsuit purchase was not her best, but it sparked her obsession with the clothing item.

"I love a jumpsuit. I remember I was at a flea market in LA and I got a jumpsuit there - a really disgusting polyester, black, classic 70s jumpsuit, about five or six years ago," Byrne told Harpers Bazaar's The Look blog.

"Then that was it."

The brunette's jumpsuit choices have become more glamorous since her first buy. She famously wore a tailored number to the Hollywood Screen Actors Guild Awards this year, which was seen as controversial.

Byrne finds it surprising that in modern life the fact she didn't opt for the traditional floor-length gown worn by Hollywood actresses was frowned upon.

"I never imagined it would be such a controversy for a woman to wear pants in the year 2012."