I feel like a university pack could be a general get educated pack that comes with private schools (ts2) and boarding schools (ts3) as well as uni
I would have uniforms for private and boarding, the boarding schools could be like Hogwarts where it's similar clothing options but different accent colors? For me I wouldn't mind if it was a set outfit with limited options swapping from skirt to slacks, blazers to summer shirts and jumpers. But the easiest way to please everyone would be just full customization, I'd rather they "customized" their uniform (unlocked on joining school) by adding accessories, socks or tights sort of thing and jewellery. Maybe some extra versions where the uniform looks grungy or has a prefect pin that can be swapped in