The bargain-bin Yu~ki in the men's section amuses me
I don't know that any "elegant gothic" brands amount to anything more than cosplay though. If you like stuff on the EGA side like brocade, uniform elements, lace, etc. (or Mana's old favorite, paisley

) maybe it's best to find pieces from actual clothing brands that incorporate those elements.
I mean, Dolce & Gabbana has you covered for the more florid silken brocade-type pieces:
https://www.ebay.com/itm/186837553749
Or for that matter, you could even adapt something from the "prom wear" end of the spectrum, like Pal Zileri Cerimonia or similar.
As far as I can tell there's no one who
reliably does "admiral coats" or capelets or other aristocratic staples, but it shouldn't be too hard to find someone doing it at any given time.
I mean, here's something I stumbled on just now that would scratch the capelet itch:
https://shop-us.doverstreetmarket.c...acket-half-moon-jkt-black-rp01e7731-s-09-ss25
(I highly recommend window-shopping at this place for those of you in New York... and then taking your inspiration to somewhere cheaper

)
For lace ruffs and jabots and whatnot I'd just go on Etsy, plenty of people make that stuff in varying degrees of quality.
My favorite "faux-Moitie" flourish: Sutor Mantellassi makes shoes with "Mana-blue" soles... or used to. I think they moved to Korea and/or went out of business now.
https://www.instagram.com/sutormantellassi/