The fabric is a type of minkee and the binding was pre-made and sewn on. I learned a few things. 1) don't sew the fabrics together on the reverse side; just on the front; 2) sew more slowly (I didn't); 3) sew all the way to each edge, so that the corners lay nicely together. It turned out okay, but the next one (if I make another) will be better.
Oh and here's another $1 item for my list. I want to make the top.