In the first book of Osamu Tezuka's "Buddha", one of the main characters is Chapra, a shudra (member of the slave caste).
He is marked as a shudra by a brand on his foot; at one point he even considers chopping of his foot to get rid of this mark.
Later on, Chapra manages to pretend that he is a member of the much higher Kshatriya (warrior) caste.
During this time, he participates in a tournament. The tournament takes several pages, and it is clearly shown that his feet are not covered.
So how come nobody at the tournament noticed his mark? Did Tezuka overlook this, or did I miss something?