This outfit was inspired by the Sofia the First episode "The Floating Palace". All Sofia did was dip her toes in the water, and her magic amulet turned her into a mermaid. She then helped another mermaid named Oona recover a magic comb and save her undersea kingdom. The swimsuit was based on the top part of her mermaid transformation.
I'll be uploading a variation of that swimsuit soon, so stay tuned.