Have you been to the museum in Bath? I haven't (didn't know about it at the time), but I have been to the Costume / Fashion museum there and there are quite a few lovely fashions of the Regency Era on display.
I've been to the museum! It's OK, but not great, in my opinion. I mean, if you're in Bath and have a couple of hours free, you might want to stop in. But I wouldn't make a special trip or anything.
Several years ago the Costume Museum had a special exhibition of all the costumes worn in television and film adaptations of Jane Austen's novels. That was really great! Great, but also a bit depressing to see how tiny they all were. Kate Winslet who, at the time, was always referred to as a "larger actress" (gag) was teensy! And don't get me started on the men. Alan Rickman, Colin Firth, etc. All so very small. The clothes were all in glass cases that were visible from all sides, so you could tell that nothing had been pinned or changed to look smaller either.
Anyway, I do love Austen and have read them all several times. My book group did
Emma this year - not my choice but it's still good; just not my favourite. I don't think you can beat
Persuasion.