Actually, before I found a jacket I could alter at the good will, my friend suggested getting an actual Japanese school uniform from somewhere and altering it. That may be an option for you. Or, if you can find a pattern somewhere for a uniform, that might work, too.
"Here's another curse: May all your bacon burn."
Future Cons: Anime Expo 2014 (L.A)
100%: Yosuke Hanamura (Many outfits) (Persona 4)Current Projects:
Junpei Iori (Persona 3 --with my friends.)
Kaoru Kamiya - Kendo uniform (Rurouni Kenshin -anime)
BTVA voice acting profile