I've never seen Japanese uniforms over the years. Siosai's accessories are probably the closest you'll find and all of his models seem to be excellent quality - check out the other categories.  I'd take Xantor's suggestion and try to fake the pants and blouse/jacket.  Siosai has just about everything else you'd need.   

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken