I have found several very useful guides relating to travelling in hot weather conditions. Each of these guides also includes other useful information about travel abroad. The first one can be found at: http://www.verber.com/mark/travel/packing.html
about half way down the page.
This post: http://ask.metafilter.com/22843/Is-travel-clothing-worth-it
goes into some specifics as to what types of clothing materials work better than others in hot weather. For instance, you don't want something that takes forever to dry or does not breathe well.
Labels: hot weather, sweat, travel