A Sydney hotel worker is facing time in prison after pleading guilty to stealing up to a thousand pairs of underwear from female guests.

Daniel Hamilton also pleaded guilty to new charges on Monday, after he tracked some of his victims on social media.

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Hamilton worked at the Ibis Hotel on Pitt Street in Sydney’s CBD but once he was sacked, he moved on to the Rydges at the international airport.

It was there that he was caught red-handed by guests who returned to their room to find him crouching behind their bed.

“Sorry, I thought you’d checked out,” he’d told the guests at the time.

Hamilton will be sentenced next month. Credit: 7NEWS

Two more victims were identified, with Hamilton pleading guilty to accessing the suites of a total of four women and their daughters, rifling through their luggage to find used underwear and stealing it for his own sexual gratification.

Hamilton’s victims told 7NEWS they’re still feeling violated, ashamed and embarrassed.

“We’ve been on one trip since then. and we made sure we left the do not disturb sign on the door,” one woman, who wished to remain anonymous, said.

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“But I’m glad he’s pleaded guilty.

“Hopefully he will get help because I think he needs it.”

Hamilton will be sentenced in April.