The summer is blazing hot, so short sleeved Serve shirts for Elders and light weight dresses for the sisters. The winter gets cooler, but a long sleeved shirt with a sweater over it is fine. For important meetings like meeting with the mission president or church are the only times a suit coat is worn. There is a pretty even split with walking, biking, and driving. A basic sling bag is what the missionaries typically carry.
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Serve shirts have a ventilation panel in the side of the shirt making them noticeably more breathable. Missionaries serving in hot or humid places absolutely RAVE about this feature. The most popular shirt for hot-climate missions, for sure.