What the host wears first depends on the type of party. The dress code for entertainment parties is definitely different from that for political/business parties. Generally speaking, a decent suit is a common choice for male hosts. In addition, indoor or outdoor can determine the color matching of clothes. As for the shirt you care about, if it is a formal dress, it must be matched with a formal dress shirt. If it's leisure suit, shirts can be matched casually. Be sure to pay attention to the color matching of shirts and suits. The tie is the same, the color and style must match. Temperature conditions can be properly considered, but the nature and atmosphere of the party should be given priority to. If you need to wear a suit for an occasion, you must wear it no matter how hot it is. Fill in more information, or I won't give you a specific answer.