Thank you, everyone for the replies about what are and where to get the upholstery pins.

Thanks to all with help for making an armchair caddy and also help with navigating this site.
Linda from Clinton

And believe it or not, I've even seen those curly little spring shaped pins at the grocery store in the little tiny hardware section. (I know, I couldn't believe it either.)

I like the idea of a chair pocket! If you made the fabric much longer you could go under the cushion and have a pocket on the other arm of the chair. Two for one chair (more is better;). Thanks for the link and idea.