Do not Overmatch.
Because you are wearing a blue dress does not imply that your bag, shoe, scarf, or even your jewelry must be in blue color. Utilize your neutral colors well. Neutrals are colors that work well with all other colors. They are impossible to clash. Examples of neutral colors are: black, white, grey, navy, brown (including camel, khaki, beige, etc). Navy and brown are not technically neutrals, but work so well with such a high number of colors, they are considered as such in the world of fashion. Instead of neutrals, you can also opt for metallic colors like silver and gold.