What you want to ask is what clothes to wear to pour water for a meeting in summer? Wear a formal suit. Tea pouring at the meeting is a conference service, and everyone has a dress code. Basically, tea is poured in a formal suit, wearing a bow tie, and the hair is coiled up with a hair cover. Wear light makeup, stockings and shoes, all of which are formal etiquette service clothes, a bit like a stewardess, but without a hat. So wear a formal suit.