It' been a couple of weeks since I made this swim suit cover, but couldn't get a decent picture. So I just gave up and went with what I had. I do apologize because we had already been down to the pool when I had Dax take these (and had a couple + drinks).
Anyway, this is super easy and only took a few minutes to make. I found the original by looking on Pinterest. (I know. I know. I may need an intervention.)
You can find the original post and tutorial on La Vie En Rose here. She has several variations with tutorials.
Seriously, I don't think it could be easier.