One of the biggest aggreivations of coordinating colors with clients is the millions of names dressmakers come up with for colors. So many women were coming in saying "cornflower" blue dress....which I think of as this:
The best solution I've come up with and encourage brides/clients to do this...go to the local Home Depot/Lowe's, etc and go to the paint section. Play with all the strips of paint samples. This is the best way to group different colors together. Ignore the names on the samples. Bring the samples in along with actual fabric swatch of dress. This helps ensure everyone is on the same page and the same color scheme- no matter what it's called.