Tell me more. I didn't really have many ideas in mind apart from ears and tail coming into existence, and hands going into claw shape, not much of a connoisseur of the catgirl craft. What other important features should change with the expansion?
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For catgirl tails longer and thicker. Think starting at a normal cat and going to snow leopard/pallas cat and beyond. I want to say to treat it like a snake getting fatter and longer but I'm unsure if that would provide the best mental image?
For foxgirls (mentioned cause it says catgirl, foxgirl, etc. in the option) starting thin and puffing outward as it gets longer. Maybe more tails fanning out at certain stages? Would differentiate it from the catgirl for sure going fanned out and wider instead of a continuous extremely long tail.
Wish I could just point to an example and go "like that!" but most of the things I could say to look up are flooded with like... balloon-style inflation instead of the tails actually like... growing bigger, longer and fluffier.
Sorry if this was the opposite of helpful.