By and large even indigenous people, in very warm climates, with little to no outside influence and with no qualms about the human form still insist on wearing cloths of some sort.
Although we have some shared flairs, I think your question might be better suited to /r/AskAnthropology. If you are interested in changing views on nudity in more modern societies this is perhaps the place, but you seem interested in the concept in very early societies, so that is the better focus.