She posted a picture of the pants, writing: “Don’t think much of Virgin Atlantic’s new pyjama policy!”
One woman wrote, “Oh that’s so gross! – hope your flight gets better!”
Another remarked, “At least the seat is wipe clean.”
Virgin Atlantic replied to Rebecca on Twitter, “Hi Rebecca, I am so sorry that this was on your seat as you boarded the flight.
“Please make a member of the crew aware of this immediately.”
A spokesperson told Sun Online Travel, “We’re sorry to hear of Ms. Naish’s experience on board one of our aircraft, and would like to apologize.
“We never want to disappoint our customers, and will be looking into this incident as a high priority.”
One woman was caught taking it one step further after deciding to dry her knickers using the overhead vents during a flight.
Another man stripped down to just his boxers during a flight – only for cabin crew to do nothing about it.
This story originally appeared on The Sun. Read more content from The Sun here.