I've had problems when asking about the optical and electrical properties of materials... whether fabric or plastic film, the guys at the stores generally only know what the label says. I would recommend using a camcorder with *really* good night vision (like a Sony Handycam with "super nightshot" from 15 years ago, or one of those little gold colored $20 cmos security cameras), and bring it to the fabric store. You don't have to record, if you have a little screen you can watch for fabrics that look *very* black.
Just remember if they think you're recording they may decide to kick you out.. and I've found that humans can be really dangerous if you try to burden them with reality *after* they've formed an opinion.
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