After reading a bunch of comments about people using electronics in this post, I had initially pictured “jumpers” as either “jumper cables”, the things people use to boost car batteries with, or small plastic coated pieces of metal or wires that can be placed over exposed pins on circuit boards to connect them (e.g to enable some behaviour). Generally I’d only assume this meaning in a discussion about electronics, though.

(I’m not the person that you replied to, and I knew that jumper means sweater or jacket or something in British (and possibly Australian?) English.)

And now that I think about it, most of my clothing gets worn after a few years, at least on the elbows.