It was hard to pick one! So I picked three and you can pick one. Or go to Creative Costumes of Still-Practiced Pagan Rituals to suffer the same dilemma.
Are they beasts? Are they humans? If human, what's the purpose? Are they wearing the uniform of a tribal role such as shaman or hunter? Is it for a yearly festival or ritual? Or something else? Is their world as primitive as their outfits? (Isn't it great being a writer? :-))
French photographer Charles Fréger spent 2 years traveling across Europe documenting pagan rituals that are still being carried on which he's gathered for Wilder Mann: The Image of the Savage.