Conjoined Möbius (aka Klein Bottle) Hat

I had always known that a Klein Bottle could be made by joining two Möbius strips. Many years ago I made a fabric version which could be put together with zips but had never thought of making a knitted version - until I was inspired by Debbie New’s Garter Klein Bottle Hat.

I adapted the clever technique Debbie used, and added some modifications to create two strangely-shaped Möbius strips which are then stitched together. I used two colours so that the two halves can be distinctly seen but the hat could be knitted all in one colour.

I used approximately 135 metres in each of the colours. The hat is stretchy so will fit most adult heads.

The knitting is easy. The stitching is fairly easy. The baffling bit is turning the finished item to make it hat shape!

Erratum - September 2013
There is an error in the original pattern that means the hat comes out at half the size it should be. This has now been corrected. We apologise for making it even more mind-boggling than it ought to be.