​Sell a sweater that’s designed to be ‘unravelable’.

It looks and functions like a perfectly ordinary sweater. But it’s made of a single mile-long piece of yarn, and the end is marked.

If that marked yarn end is pulled straight behind you, such as if you’re walking away, the entire sweater will unravel without snagging on your arms or neck.

It’d be a fun gag gift, if nothing else.