Rose Williams
Patterns available as Ravelry Downloads
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Crochet: Shawl / Wrap
This pattern is not really a half circle. It will create a slight hump at the neckline to allow the edge to fold over for the collared look.
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Knitting: Shawl / Wrap
This pattern has not been tested or tech edited. It uses one ball of yarn and is quick to knit. Enjoy.