How would you complete this pattern?
The answer is
There are 3 articles of the same type and colored clothing. Following a rule that there are 3 of each item, there would logically be 1 purple shirt, 1 pink hat and 1 blue pants remaining in the 3 by 3 grid
Answer could also be
It looks like a font made of clothes, if you read it, it says 'unpuzzle(d)'
WarforgedMystic's answer is probably the intended one, but another answer can be justified.
the grid would then contain 2 pink hats, 3 orange hats, 4 green hats; 2 purple shirts, 3 brown shirts, 4 blue shirts; 2 blue pants, 3 red pants, and 4 yellow pants.