Answer: The ribs on the corduroy have a baffle-effect, and as hoped, the fabric hung on the door serves to absorb the noise funneled down the two halls. Works quite nicely.
By the way, for a slight fee, Phoebe & Johanna will be happy to come help set you up to follow this home décor trend. You supply the skirt & we’ll provide the gross-grain ribbon & labor. Please specify ribbon color: jewel-tone, blue, raspberry, cardinal red or lady pink. (Grins! Julia)