Thanks to everyone who left their guess in the comments yesterday. As you can see, it is a slipper. Not a bikini bottom like my husband guessed!
Unfortunately, I don't like it. It is a cute idea, both of the ends fold over the longer middle strip and you sew the toe together (it is three layers thick) and then you sew both side seams. Once is is all together you (or at least I did) end up with a very funny looking heel.
I am not even going to finish the second one. I am moving onto a sweater project.