Answer:
Celts
Step-by-step explanation:
The Celtic tribe painted blue with woad and they used to run naked when they were going to the battle. The aim of painting themselves was to protect themselves from their enemy as well as a sign of improving their velocity. Woad as also a hallucinogen that was very powerful.
However, most ancient tribes used different methods, such as decorating their bodies and tattooing, which was a sign of their battle, rituals, and spirituals. They also covered their bodies with different kinds of animals decorations, and because of this, they did not wear clothes.