I am crocheting an evening purse. It's an openwork pattern, so I will line it. I've been looking at purse frames. These are the metal frames you will see in change purses that snap shut. They are made with holes to sew the material on or use crochet yarn. Some just have slots that you would glue the material into. There are many styles and sizes. Google "purse frames". I've almost decided to use magnetic sewn in clasps. The purse is @ 6" square. I will attach three magnetic clasps, one in the center and 2 on each side. I like the idea of a button also, sewn to the top of the front and a loop on the back. This will help to pull the sides apart.