Beanies are typically informal and worn for casual occasions, not formal events. He chose a beanie for the outdoor gathering, not the business meeting.
Pro Tip 2/3
Cold Weather
Beanies are especially popular in winter for warmth and comfort. She always packs a beanie for her winter vacation trips.
Pro Tip 3/3
Fashion Accessory
While practical, beanies also serve as a trendy fashion accessory. His red beanie added a pop of color to his all-black outfit.