A maximum of 12 girls can belong to the fashion gang. One example of the outfits they could wear is presented below. A gang of eight girls is the smallest that could satisfy the difference constraint in such a way that adding one more girl would violate the constraint. An example of an "exclusionary dressing" for such a gang is also shown below.
One example of the outfits that could be worn by a 12-member fashion gang:
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