The following link will take you to photos of an embu at Shiramine Shrine, near my home in Kyoto. The Shiramine embu has practitioners from koryu like HNIR kenjutsu and kusarigama-jutsu. Note from the photos that the koryu practitioners do not wear keikogi. I am (tabun) sure kendo's indigo uwagi is adopted from Kano's design. Kano designed a keikogi. If you wear it for judo, it is is a judogi. If you wear it for kendo, it is a kendogi. If you go into Tozando, they are selling different things for different arts, but the differences are recent and pretty insignificant, like where the seam is.

http://www10.ocn.ne.jp/~siramine/page041.html