James McElvar, 19, from the Scottish group Rewind, was about to board an easyJet flight from London Stansted to Glasgow on Wednesday when he was told he had one carry-on bag too many.
Staff said he was allowed to take only one bag on board, so would have to pay USD 70 excess charge or bin his second bag.
With his band mates already aboard and just minutes to spare, he made a foolhardy snap decision, emptying his rucksack and donning the entire contents.
"There was a lot of clothes. It was very difficult to walk onto the plane. I managed to sit in the seat for a minute or two. But I just couldn't take the heat," he said on the band's Twitter feed.
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Barely able to move, he could not even get the seatbelt round him.
"I was sweating and they kept asking me to put the belt on but I couldn't sort it," he said.
"It was just a nightmare I was having."
The singer has no memory of the rest of the flight and was taken off the plane at Glasgow Airport to a waiting ambulance.