The antonyms for the phrase "most bareskinned" could be "most clothed" or "most covered." Bareskin refers to being without any covering or clothing, so the opposite of that would be having complete coverage or dressing up. Some other antonyms for "bareskinned" could be "fully dressed," "attired," "clothed," "robed," or "garmented." These words refer to the opposite of being exposed, vulnerable, or without anything to protect oneself. So if someone were to describe a person as "most clothed" or "fully dressed," it would be the opposite of describing them as "most bareskinned.