Answer:
To distinguish Sugriva from his brother Bali.
Step-by-step explanation:
Sugriva and Bali are the two brothers of the epic "Ramayana". They entered into a disagreement because of a misunderstanding. Bali abandoned Sugriva from his kingdom because of which he had to live in the jungle. Rama helped Sugriva to take revenge from Bali. He gave Sugriva a necklace made of flowers to make a distinction between the two brothers.