Name: cre8ivecat
Message: I too have a formal %100 polyester "dry clean only" dress, that I would love to make black. (It is currently grey). Am I out of luck? I think I could wear it more if it were black. Any suggestions would be great!

Sometimes, a dry-clean-only garment can actually be washed. You could try washing your dress. If it survives, you could then consider dyeing it. See Dyeing Polyester with Disperse Dyes.