Thanks to @Yamahana i was able to get two sets of vintage buttons. Unfortunately, they didn't match FL's brown pony Shinki. But since they're made of tagua nut (also know as vegetable ivory) they're easy to dye, so I bought some fibre reactive dye and let them cook for an hour. They came out perfectly.
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These are cool!
I also bought vintage buttons for my FL, although right now i am starting to lose hope i will ever see them on a jacket...