Actually, you coudl also buy an existing doll/figure, modify it with clothing and it might even work...take this for example:
http://www.amiami.com/top/detail/det...%24pagecnt%3D1
I know that some 1/6 JGSDF figures exist, so Japanese forces fatigues are available somewhere. The black shirt is also easy (You can even order a couple from Azone or Amiami, I think), and all you need is a jacket and dogtags...
...and I think you won't have trouble customizing Yuzuka's hairpin.