The egg warmer is worked bottom up. It’s laid flat when it’s time to close the opening at top. Then it’s possible to crochet through both sides at the same time.
The egg warmers from the 70s looks almost like this. Aud B had a couple, and wanted to make some more of them. But she did not have any pattern, and made one herself.
The entire pattern can also be viewed at this side: Heklet eggevarmer.
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