I started with 2 coats of China Glaze Dress Me Up. I used a slightly darker color than a nude so the girls can show off their tans. :) Now my bathing suits and bikinis aren't quite as well drawn as hers, I still think they are cute. I tried a few different styles and some were easier than others. I think if I had decent brushes, it would be a bit better.
Instead of a yellow dot bikini I have a yellow gold dot bikini :)
Here is her tutorial on creating swimsuits. Hope you enjoyed!