This had me all excited that I was about to learn something.

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Paddy and Mick worked together in St. John's and both were laid off. So they went to the unemployment office.
When asked his occupation, Paddy answered, "Panty Stitcher. I sew the elastic onto ladies cotton panties and thongs."
The clerk looked up panty stitcher on his computer and finding it classified as unskilled labor, he gave him £80 a week unemployment pay.
Mick was next and when asked his occupation, he replied,"Diesel fitter."
Since diesel fitter was a skilled job, the clerk gave Mick £160 a week.
When Paddy found out he was furious. He stormed back into the office to find out why his friend and co-worker was collecting double his pay.
The clerk explained, "Panty Stitchers are unskilled and Diesel Fitters are skilled labor."
"What skill?" yelled Paddy. "I sew the elastic on the panties and the thongs. Mick puts dem over his head and says: "Yep, diesel fit".