Cochabamba is warm with a rainy season. It's nickname is "city of eternal spring" because of its nice weather, but some areas can get cold.
Get GOOD, COMFORTABLE shoes. You will walk A LOT in this mission, sometimes on uneven roads.
You will need some sweaters or a light coat. In some areas it can get quite cold, especially in the mornings and evenings. There are not heaters in the apartments, so pack some thermal garments, a warm hat, good wool socks, gloves, and sweats or warm pajamas for sleeping. Missionaries can buy sweaters there as well.
Mostly short sleeved shirts, with some long sleeved.
Sisters: bring a few warm dresses and pants for the winter.
You will also need either a rain coat (a 3-in-1 with a zip out liner), a poncho, or an umbrella. The rain comes unexpectedly, so some missionaries prefer a poncho or an umbrella to carrying around a coat.
Some areas have laundry services, some areas you will wash clothes by hand and hang dry. Dish gloves are very handy for the areas where you wash clothing by hand.
Altough backpacks are not allowed for everyday proselyting, bring a backpack for transfers and exchanges.
Do not drink the water. When eating out, don't drink anything with ice cubes either. Every apartment does have filtered water, so you can fill a water bottle, but many recommend bringing a filtered water bottle with extra filters for peace of mind. Bring some probiotics and electrolytes as well.
Several parents have stated that LDSxpress has worked for getting packages to their missionaries. It is pricey, but reliable.
There are pensionistas that prepare food for the missionaries.
They use cash, so being able to pull money from an ATM for personal funds is best.
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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.