My shop closed up after Ike, so I order mostly on line. Mostly the fabrics are brands that I am familiar with and know they are quality fabric. I have never had a problem. Monitors are different but usually they will put color in the description, read that.
Most online stores are also have store fronts, so they stand behind their fabric. If you are disappointed, I would call and talk to them. I'm sure they will want you to be happy about your purchase. I have had great customer service from all that I have dealt with.