Matt Parker on Twitter: "For people asking: the Klein Bottle Hat I'm wearing requires some self assembly. Here is the knitting pattern: https://t.co/D6I1IF4Ez8 https://t.co/uHDeBHbaUF" / Twitter
Ravelry: Klein Bottle Pi Hat pattern by Judy Parker
Knitty: Summer 2006
Klein Bottle Hats
Klein Bottle Hat! | Mad science gift from my thoughtful sist… | conradh | Flickr
Klein Bottle Hats
Anna Knight - Knitted Klein Bottle Hat | Mathematical Institute
sarah-marie's knitted klein bottles
40 Klein Bottle Hat ideas | klein bottle, hats, klein
Klein Bottle Pi Stripe Hat | Etsy
BRAIN DEAD IN THE BOOK AISLE; KLEIN BOTTLE HAT FINISHED | String-Or-Nothing
Conjoined Möbius Hat pattern by Woolly Thoughts | The Aperiodical
Klein bottle hat | NomadWarMachine
Ravelry: Klein Bottle Pi Hat pattern by Judy Parker
Klein Bottle Hats and Scarves
manly stuff | Granny Mauds Girl
Klein Bottle Hats Plus | Creations by Maris
Knitty: Summer 2006
Klein Bottle Hats
Ravelry: Two Klein Bottle Hats pattern by Debbie New
Klein Bottle Hats and Scarves
