Depending on how #basic you're fine with you can always try sites like sexpot.jp or algonquins.jp. SPR ships all their items overseas with cdjapan.co.jp and i'm pretty sure algonquins does too.
You could also try closetchildonlineshop.com - they've got a huge variety at really nice prices, but they're all used so you've got to be okay with checking pretty often to find a certain type of thing. They also ship overseas, from their own site, but i'm pretty sure they've written instructions in english.
ofc if you're broke as i am and want to get creative to make things work, someone i follow on tumblr made this really helpful post
But this is all a non-answer ofc, bc i'm pretty sure bands as funded/famous as Versailles just have private designers on hand.
closet-child might be your best bet though - i've definitely seen some stuff that at least looks like a cheap imitation of tambi-ish style.
hope at least one of those links helps!
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