Final answer:
The question asks about what the Cocos wore to the Alterna-Fiesta, but without more context about the Cocos' cultural background, it is difficult to provide a specific answer. However, there are examples of traditional attire worn during fiestas and celebrations in different cultures.
Step-by-step explanation:
Based on the information provided, it is unclear who the Cocos are in relation to the Alterna-Fiesta. However, there are several examples of traditional attire worn during fiestas and celebrations in different cultures.
For example, in the Aztec culture, during celebrations, celebrants would wear feather and bone breastplates, traditional headdresses made from bark, and long skirts. Goddesses responsible for crops, like Chicomecoat, would wear long skirts and headdresses made of paper. High-level individuals may have worn embellished clothing with cowrie shells and raffia thread.
Without more context about who the Cocos are and their cultural background, it is difficult to specifically answer what they would wear to the Alterna-Fiesta.