One can always wear an ensemble of plain colors. However, it is likely to soon become quite monotonous. Similar to one’s ability to mix colors, pattern mixing is also an art that can enhance an ensemble.
The secret of pattern mixing is to keep the pattern scales different. Given below are some examples:
Four Patterns: A green broken herringbone tweed is overchecked in red, orange and blue. It’s combined with a pink and blue checked shirt worn pinned, a burgundy on brown club necktie, and a silk paisley pocket square with a blue ground.
A pink and white check shirt and a green and white check tie. The patterns are not clashing because the difference in scale of the shirt and tie.
Mixing patterns and textures:
A self stripe linen suit, a blue/white linen gingham shirt, a blue textured silk knit tie, a blue/gold printed silk pocket square.
Mixing four patterns:
The photo below shows a check suit (glen plaid) paired with a check (gingham) shirt. Mixing of these two pattern is possible because both patterns are subdued and of uneven scale. The check tie and check pocket square is also not clashing.