My daughter has a doll that she loves. Obsessed would be a better word. She loves to buy her things or make her things. Lately she has wanted to get her a swimsuit but they are ridiculously expensive for clothes. So we researched and found the idea of making a swimsuit for a doll out of a sock. At first we didn't believe it would work but we were amazed.
First you need a sock. I used a knee length girls sock. Fun patterns are a must. I think you could use a smaller sock if you needed to. We had a lot left over.
I ended up just cutting opposite the heel.
Cut a small oval, really small.