Quote - The GPL is very restrictive; Using the example of a figure, since conforming clothing uses the figure's grouping and rigging, any conforming clothing for a GPL licensed figure would also be GPL licensed...

Something akin to the "Classpath exception" could be used to avoid that problem.

Anyway the GPL and other software licenses are generally a poor fit for none code things (q.v. MakeHuman)
The CC liceneses are a better fit, but some thought is always going to be required to best match some existing license with the precise desired intent (and is the reason why some groups erroneously create their own).