Update-while they do block out the light, one of the charcoal sets arrived with a defect so they are being replaced. There is a strange color/crease that I can’t get out with a hand steamer. The navy sets that I have ordered have all arrived in perfect condition. 
Absolutely beautiful curtain set. I highly recommend:) We just hung out curtains and they are beautiful. They really do block out light and give us the privacy that we were looking for:) I am thrilled with the purchase!