I haven't quite hung up my little curtains yet, but holding them up to where they belong, they will work just wonderfully. The fabric is simple. Blends in nicely with the surroundings. I'm using them to cover the base of a metal fish tank stand.
Lightweight fabric wouldn't block much light if that was the intent.
Product Review for: Jackson Curtain, 58"W X 24"L Grommet Tier Pair - Close Out