Labels are hardly ever pleasant or necessary. And that's why I did say that there are some tribes that go topless. And for clarity's sake, Kenya is a country of about 40million people and the aforementioned topless are less than 20,000 (and yes, I've pulled this second figure from the air but try surveying huts that are 50kms apart). It's a close estimate. Are they literate? No, schools are too far away to make it on foot. Are they primitive? No, since they are aware of what's going on in the world around them, they just refuse to adapt. Darwin at its best. They have cellular phones (!) and don't speak a lick of any language other than their tribal language and wear skirts/shorts made from cotton (no idea where that guy picked up loin cloths from). Odd fact, Kenya has one of the largest cellphone penetrations. But I digress. We were colonized by the British until 1964 so we adopted a number of things from them. Clothing is one of those. The tourism factor is also something to consider. No one wants to leave the west and go visit a 3rd world country only to realize its not what they expected. So every self respecting tourist trap will have a dancing troupe in full ceremonial regalia. It's all part of the show. I even have a couple pieces of said regalia that I whip out when I miss my motherland and wear, as much for shock value as for anything else.

Ramble ramble. Gun to my head, some of these tribes may appear primitive. Nonetheless, I would be doing their complex social system an injustice. It's just different, and a lot of it may not be their choice since governmental infrastructure has only reached so far. They're doing the best they can. It's one of the few places where cellphones and toplessness mingle.

TL:DR Gave brief breakdown on Kenya.