Bring really good socks. Cannot receive packages. Dr. Martens hold up well, but break them in really well as you'll be walking a ton! Docs aren't for everyone. They can be considered heavy with all the walking, so other shoes that have been great are Ecco and Johnston & Murphy. All the shoes wear out so, 3-4 pairs has been recommended, since you walk on mostly dirt roads. A bucket hat has been nice too, as it is crazy HOT and humid for most of the year. Light weight golf pants are super nice. Microfiber towels are nice to carry around. Take a rechargeable fan for sleeping. Peruvian visas take quite a lot of time, so get started right away.
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Most parents send their Elders with at least 1 suit (most countries in South America only wear suits to church and meetings) and around 8–10 golf pants. Families are sending more shirts because of heat and humidity — 12–14 is the average. Note for Sisters serving in Brazil: feminine hygiene products are expensive there and tampons are often considered taboo. Be prepared to send a good supply with your Sister Missionary.
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.