I am a huge Pretty Woman fan (who isn't?) and on todays shopping trip I found and quickly purchased this spotty sun dress by Dorothy Perkins for £39.50.
Dorothy Perkins call the colour of the dress "Rust", but I would say it is more copper and true to the Pretty Woman pictures above.
It is possibly the closest copy I have seen to the spotty dress Julia Roberts wears in the film Pretty Woman. It is the same colour, shape and all that is missing is the hat, white gloves and Richard Gere.