Underwear

So as for underwear, I would recommend against the white variety. Like any white clothing they show dirt and filth more clearly (especially poopstains). But who is going to see your underwear? Most likely everyone. You see, washers and dryers are most likely going to be a luxury during training and while at site, so your clothing is going to be washed by hand and dried on a line. In my house, the line is on the roof, so my clothes wave freely for a day or two above the house like a proud flag of flannel and what ever else I threw in the wash. And chances are, you'll have the poops with some frequency, and white underwear will let your family and friends know just how that ceviche hit you...

As far as type goes, personal preference I guess. But remember, it will be hanging up so nothing too risque. Not sure what other people where, but I think your regular cotton variety would be just fine, just bring a lot (turnover from laundry day to back in the drawer can be three days for me). On the other hand, maybe think about investing in some higher class underwear. Brands like Exofficio, REI and even sport brands like Underarmor and Reebok might be worth the investment. Brands like these tend to be more durable in the wash, as well as 'moisture wicking' the easy the comfort in hot days. You can also rotate them in and out to air them out, thus using less pairs. They also wash easily and dry quickly, giving you a quicker turn around time if you need an emergency wash. I've also washed mine in the shower for a quick fix (was out of underwear).

Why is this important? Well, things are always a bit different as a Peace Corps volunteer and some commodities we're used to just don't exist (washers/dryers, quality readily accessible underwear) and you can't just run to Wal-Mart or wherever while you're at site. So a little foresight helps.