Definition of "gei"

I peeled off the sweatshirt and Smith got out of the gei, so we sat there, me in my colorful board shorts, Clarke in a white martial-arts uniform and black belt, Smith in a black Speedo, and Jason in his black muscle-T.

2003, James Henry Littlefield, Sweet Deal: A Trucker Deal Mystery, page 165

The uniform you see me wearing is called a Gei which all students are required to practice in.

2006, Jackie Grant Miller, Keeper of the Arts: The Story Begins..., page 17