We're all putting in our 2 cents, right? X3
I think something like this for the girls would be good...
And for the boys, it'd look sorta like Ikuto's school outfit...
My only change of color choices would be each Gijinka would have a different color based on their type. (I.e. Ice light blue, fire red, grass green, etc.) The girls would have something like colored ties/bows and the boys color would be on the accented stripe along the edges.
What do you guys think of these suggestions? =3
