Quick, dirty and cheap: put velcro strips under the overhang. Make curtains, maybe with the bottom weighted, with the matching velcro at top.
If your hubby is handy, I'd mount some aluminum 'U' channel around the bottom of the overhang. You may need to do three straight runs, one at each side and one at the front. Fabricate some sliders (or you may find some unistrut sliders the right size) to be curtain hangers. Leave the ends of the channel open some you can put the curtains up when you want and take them down likewise.
Frankly this would seem to be rather on the claustrophobic side to me.
