All students, Instructors, Professors, and visitors must wear the official Gracie Barra uniform on the mats. The uniform pants and top must be the same color. Of the aspects, the GB uniform plays a unique role. It helps to define the Gracie Barra learning experience while promoting the core values of GB: brotherhood, expansion, and integrity. All this from essentially a piece of clothing? Yes! The uniform must be clean at all times. A dirty uniform is a sign of disrespect. The uniform must be worn at all times on the mats.