Well it depends. While I oppose censorship for censorship's sake, many native tribes, including the Yanomami do wear some western style clothes, Usualy shorts, t-shirts, speeos, jeans, and tank tops donated by missionaries, they wear them because it's a fancy new gift, at least untill they rot away from the constant mud and humidity.
It's kind of funny in my opinion trying to impose western standards of modesty on these tribes and then watching the clothing fall apart from the elements, because they can't make or repair them themselves.
But yes, if it takes place in modern times it's highly feasible. Another thing worth pointing out, that even tribes that have never been contacted by white people sometimes use metal tools, traded from other tribes who have been contacted.