I've reread Princess of Mars a couple of times in order to fully grasp the awesomeness that Burroughs created in his fantastic creation. The dress of the main characters is often characterized as completely nude, but when you read the narrative carefully there is a lot of discussion of armor, silks, and furs. It is true that John Carter arrives butt-naked to Mars, but he quickly gets armor. In several passages the armor and dress are mentioned, I just don't picture the characters as running around nude through most of the book.
I've done several sketches of Deja Thoris with various amounts of dress. Here is a page from my sketchbook.