frogs -- sort of!

I'm really looking for a simple method to hold a blouse together mid- section with a frog, or something similar. I came up with the idea of sewing two buttons together, one of which would go through the button hole. Then I thought a simple loop-de-loop from the opposite attached button to the fake button would hold it together. For the life of me I don't know how to do this. Years ago they had links with clips on either side with which up cinched the back of a blouse, and this would be ideal except it was shortlived and no one knows whereof I speak. Wish I knew how to crochet!