Wash that nasty stanky gi, or go get another swank new one with the Brazilian flag on it.
You are south of the equator; therefore, headgear magically becomes cool, like the toilet flushes in the opposite direction in Australia.
Glad to hear you're liking Brazil. Be extremely careful wherever you go, and whoever you go with, however, in the crime-ridden city of Rio.
Sig Credit to Toxic