I’m surprised you don’t like how the characters look in Rogue One - they were all designed to fit with the original trilogy aesthetic as much as possible. Actors for the Rebel pilots (or at least, the male ones) were even told to grow sideburns and moustaches to make it seem like a 70s movie. I personally think the film’s costume design nails the A New Hope vibe on the head.

I kind of get what you mean about the animated series character design though. It’s not that I dislike some of the more modern haircuts for characters - think of Howzer from The Bad Batch, for example - but can’t see them fitting in the original trilogy much either. Some clones do have some pretty silly haircuts which I dislike, but by and large I think TCW does alright at the costume design - although it’s hard to translate animated designs over to live action in your head sometimes. Rebels is a different matter. Although I’m a Rebels fan, particularly in the past I’ve thought that the colourful designs for characters such as Ezra and Kanan were too garish and cartoony (now I don’t mind it, I’ve gotten very used to the show’s own aesthetic). I do however disagree about Sabine’s design: she actually has my favourite character design out of all the Ghost crew. I’ve always loved the season 3 hairstyle in particular, although you’re right in saying that’s much more modern and again, doesn’t really carry across well to the original movies’ design sensibilities.

I think it can be agreed that many character designs look like they don’t belong in the universe as depicted by the OT. But I think the real question is whether it matters or not. Most characters from the movies in 1977 and the early 80s have haircuts that would have been commonplace around that time, because while Star Wars is set in a fictional galaxy, it definitely reflects the real world and the time in which it’s made. The same goes for modern star wars content, just fashion and design sensibilities have changed somewhat. I don’t mind that.