What type of clothing should I bring?

For a two week stay:

3-4 work pants and 1 pair of pants for Sunday and travel
5-6 work shirts and 1 for Sunday and travel
7-10 pairs of socks and underwear (depends on number of days you stay and if you want to wash them out by hand or not)
work boots and shoes for travel
toiletries
flashlight with extra batteries
Bible, pen and pad
Bathing suit during summer months (shorts are appropriate for both genders)
Towel/hand towel (Towels may be bought in Mexico to avoid carrying bulky items which would decrease limited luggage space.)