My seven year old, S, is obsessed with mermaids. She loves the show "H2O" and watches it frequently. When she swims, she tries to swim like a mermaid. When she bathes, she pretends to be a mermaid. She desperately wants to BE a mermaid.
For Christmas this year, I decided to make her a mermaid costume that I'd seen online.
It was going to be a little tricky, because I wanted it to be a surprise. I bought a monofin from amazon. I bought 3 yards of swimsuit fabric at the store. I want to make a matching swimming suit to go with it. I borrowed an old one piece pattern from my mom, but I'm thinking I'd like to have it be a tankini. But, I'll admit that 3 yards was definitely overkill on fabric, so I could easily make 4 or 5 swimming suits with the leftover fabric.
When she was distracted with other things, I measured her waist and cut out an elastic waistband from that. She was busy coloring her mermaid tail, so she didn't really even think about what I was measuring her waist for and why.
Sewing it up was surprisingly fast- I had it sewn within 10 minutes.