I just realized that I didn't explain the origin of this costume (and there are other posts with it too), it's from a set named "Éclat de Prince" that got announced during Kukugumi day (9/9) in 2025. There was a bushiroad stand in the last Animate Girls Festival with all these Seisho girls dressed in princely outfits (it really fits Karen character honestly, although I'm also a huge fan of Junna outfit/hairstyle too)

Page on the Bushiroad site don't ask me about the Conan part of the site

Might upload the individual renders if I'll find them in a not-potato resolution (alongside all the other more obscure stand outfits). This close-up is much better already.