The easiest way to color block with clothing is to take really bright colors and put them together. For instance, try wearing a dark blouse with a bright colored skirt. Another alternative is to wear a very simple outfit but with a pair of shoes that are multi-colored. Even adding really big and bright accessories will help but make sure not to go overboard.
Here’s some color blocking ideas:
11. Topshop Colour Block 1 Shoulder Tunic