A Jumper

This, without doubt, falls into the "I didn't know you could do that" category.

Two chaps from Fife patented a jumper in 1993. FirstFoot thought that jumpers had been around before then. But this just illustrates how little we know.

Just to make sure that we all understand what a jumper looks like, here is the rear view:

The back of a jumper

Fascinating, isn't it?