In doing research for chest binding, flattening corsets, etc. I found an actual picture of the type of girdle/chasis that Niou wore in the first 'Masako' universe.
Padded Girdle.
The Breast Form Store might have been of interest to him as well. The Olivie part of me was certainly entertained.
Other things on the internet:
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A place that will make buttons for you relatively affordably-
A place where I could drop $350 on a quality button-making tool-
This place has kits too.... also for $300.
On an unrelated note. Nine years ago, I was in Creative Writing and Poudre, journaled nearly a page a day by hand, had never been to Japan and never heard of LiveJournal or The Prince of Tennis. Hell, I don't think I'd ever even set foot into Jo-Ann Store 1679. I'd also never played a male character in Cosplay.
Crazy times.