Haha, the "top" is typical Chinese Qing (Ching) dynasty men's wear. It's called a chang pao. Kimonos are Japanese ^^  wait, chang paos have sort of tapered sleeves...this doesn't...and also has a belt. That would be...much earlier than the Qing dynasty? Oh well whatever. XD
The pants are just...yeah, sweat pants-like, but I think the material is on the thinner side. The belt is just a strip of cloth, looks like, and the top...well, I'll draw you a picture. XD
(you have to refresh the page XD)
Well now that I look at it more closely...Nuriko's flap thing is not completely on the side, and there's also a collar. But it's about the same, just make the flap overlap a little less. ^^;;
Eh. hope that helped at least a little teeny bit. XD I'm not a pattern person, so I have no idea if there are any out there that you can use if you want a pattern.