Sewing

I am in a sewing class right now and we are making a pair of pajama pants. First you sew the inside leg seam, then you sew the crotch. At this point the pants get confusing on how to sew. A girl in my class was going strong, and was ready to sew the seam on the outside leg. She finished it, and when she went to try them on she looked at me and said, "I think I did something wrong..."

Her pants looked like this:

We could NOT stop laughing. I still can't figure out what she did to make them like this.