Outfit components that match closely in colour pull the look together. And it’s often attractive when footwear matches accessories. But not everything needs to match. For example, match your shoes with your belt or bag, and mismatch the rest.
A tonal colour match is just as effective as an exact match. Mismatched patterns work together when their palettes match. Subtle colour repetition in the tones of solids or the palettes of patterns harmonizes the outfit, creating a coordinated look.
Intense colour mismatches can look interesting. There is creativity in the clash. When in doubt about combining mismatched colours, harmonize the look by creating a perfect or tonal match with other components. That way the eye can rest and be happy.