The attention to detail is great, especially with the Weasleys. As we know, they only have a few Muggle clothes, so it’s nice to see them reuse certain pieces while still trying to switch up their outfits. Maybe I’m reading too much into it and it’s just random, but it seems like when they’re going to King’s Cross to get on the train, I speculate that Molly is the one who chose what the kids would be wearing. The kids look more put together, and the color coordination gives a more formal look. It's eccentric from a Muggle eye, but it sort of works.
Then, when you see them coming back home for summer and it looks like they’re still reusing some of the same muggle clothes, but the overall look is much more relaxed and less formal, and slightly more mismatched. It just makes sense for kids to just put on whatever and be done.
But yeah, I’ve been loving the overall continuity in the outfits and the care the costume department has been putting in. Very excited to see it all in the series.