When Jessie Gravatt hailed a cab recently, she didn't expect much more than a safe ride, a clean taxi and a driver that wore pants.

She got two out of three of those criteria, but midway through the ride, Gravatt, 21, a resident of Perth, Australia, looked over and saw the driver was pantsless and shoeless.

"I'm 99 per cent sure he wasn't wearing shorts because I could see," Gravatt told PerthNow.com. "The only clothing I could see on this guy was his work shirt. He just kept driving and I was messaging my friends the whole way letting them know what I had happened."

Gravatt said she didn't talk to him and ask him why he wasn't wearing trousers.

"He might have had harmless intentions, but if he did have bad intentions I didn't want to ask a question about it," she said.

Gravatt did manage to snap a photo of the allegedly pantsless hack on her phone, but said his driver identification was allegedly hidden from view.

She is willing to concede that there is "possibly a legitimate reason" for not wearing pants, but believed the proper thing in that case would have been to stop driving -- or at least picking up women, she told WAtoday.com.au.

Gravatt has since filed a formal complaint with the cab company that employed the driver and an investigation is underway. The driver's name has not been released, but he has reportedly told his superiors he was wearing shorts during his shift, 3aw.com reported.

GALLERY: THINGS YOU CAN'T DO NAKED

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  • Thomas Edwin March

    Thomas Edwin March, 51, had the essentials: a pair of 3D glasses, three 20-ounce cans of Ice House beer, a smashed cheeseburger, and a laptop (possibly to blast a little Bob Seger). Party time. But he got arrested because he was allegedly naked on the beach, and Bunche Beach isn't a nude beach.

  • Anthony Michael Hedger

    Anthony Michael Hedger, 24, was arrested after authorities in South Carolina saw him walking down a highway naked carrying his 13-month-old son, also naked.

  • Aydrea Meaders

    Aydrea Meaders is accused of stripping during an upstate New York school assembly. She is facing child endangerment and lewdness charges.

  • Osmer Hernandez

    Osmer Hernandez, 33, of New Orleans, La., was arrested when he seranaded cops while naked and masturbating.

  • Marty R. Parrish

    Police in Flagler Beach, Fla., arrested Marty R. Parrish after an officer saw him "walking south on the Flagler Beach Boardwalk naked" except for a hat on his head.

  • John David Kinder

    John David Kinder, 25, was arrested for allegedly dancing naked outside a Florida woman's house on Aug. 15. He was charged with disorderly conduct.

  • Matthew Ibarria

    Matthew Ibarria, a fugitive from Florida wanted for allegedly attacking a relative, was arrested after jumping naked from a car in Georgia. This dashboard video from a Kingsland Police Department vehicle allegedly shows him running away. <a href="http://www.huffingtonpost.com/2012/03/09/naked-man-matthew-ibarria-police-chase_n_1334638.html" target="_hplink">Read more.</a>

  • Tracy Mabb

    Mabb is accused of exposing herself at an intersection in Pompano Beach, Fla. She allegedly told police she didn't "give a f--k" about her actions, according to a police report.

  • Naked Chainsaw

    Lindsay Medd Stevens was arrested by police in Knoxville, Tenn., for indecent exposure after his neighbor saw him cutting a tree down -- while completely in the buff. Knox County sheriff's deputy <a href="http://www.wate.com/story/19009880/knox-county-man-arrested-while-doing-yard-work-in-the-nude" target="_hplink">Scott Ritch told WATE-TV </a>that he saw Stevens standing completely nude in his yard cutting a tree, only to run inside his house when he saw the officer.

  • Aaron Latham

    Latham, 22, allegedly got naked, stole a man's truck and then ran it into the front of a home at 50 mph. <a href="http://www.huffingtonpost.com/2012/04/30/aaron-latham-nude-man-steals-truck-crashes-through-house-delaware_n_1464836.html" target="_hplink">Read more.</a>

  • Keith Fehr

    Keith Fehr is accused of wearing a black dress and exposed himself to children at a park in Illinois. <a href="http://www.huffingtonpost.com/2012/04/05/keith-fehr-little-black-dress-indecent-exposure_n_1406703.html" target="_hplink">Read more. </a>

  • William Bliss

    William Bliss was arrested in March, 2012 after claiming four men made him carry a nuclear bomb -- while he was naked and drunk in the middle of an Iowa City street. <a href="http://www.huffingtonpost.com/2012/03/20/forced-to-handle-nuclear-weapon_n_1366879.html" target="_hplink">Read more.</a>

  • Jacob Lee Bovia

    Jacob Lee Bovia is facing real indecent exposure charges for exposing his fake genitalia to a group of women on Maryland's Anne Arundel Community College campus. <a href="http://www.huffingtonpost.com/2012/03/07/jacob-lee-bovia-arrested-exposing-fake-penis-maryland_n_1326558.html" target="_hplink">Read more. </a>

  • Joshua Greene

    It's not easy to be the most most memorable visitor when thousands of NASCAR fans come to town, but West Virginia's Joshua Greene made a pretty good run for that honor when police caught the streaking 27-year-old with a raccoon in his car.

  • Milton Hodges

    Hodges, 20, of Florida, allegedly fled to a nudist colony and threatened residents there after committing an armed robbery at a nearby Lowe's. The fully-clothed Hodges was reported to have been easily identified by his pursuers in the naked environment.

  • Chad William Forber

    Chad William Forber, 41, has been charged with possession of methamphetamine, resisting or obstructing a peace officer and possession of drug paraphernalia, stemming from an incident where he was found naked in public covered in nothing but Crisco.