Mobius Scarf – a scarf that doubles in length when you unzip it down its length
The mobius strip is shaped like an elastic band but with one twist in it. If you were to add a zip down the length of the strip and unzipped it, rather than creating 2 loops, it creates one loop that is twice as long. Perfect for when you need a longer scarf or one that is twice as wide.
FYI
and this for love
and this for lunch
Here’s the pattern and method, just add the zip.
So maths knitting is not just an idea too. more instructions here https://www.thesprucecrafts.com/mobius-scarf-pattern-4145489