Answer:
to be sure that you and your client understand each other
Step-by-step explanation:
You and the person you are selling to need to be able to know the exact colors of the outfit they may be buying in order to provide the best experience. If a client ordered a woolen sweater in the colors wisteria, magenta, vermillion, lilac, and peach, you would need to know the exact colors in order to supply the right product.