"American Ways: A Guide for Foreigners in the United States" by Gary Althen "Culture Shock! A Guide to Customs & Etiquette" This series is written by people from the country the guide is about, and gives a unique look at customs, manners, mores, traditions, and other pitfalls that await foreign visitors.
"Do's & Taboos Around The World: A Guide to International Behavior" by Roger Axtell.
"Do's & Taboos of Hosting International Travelers" by Roger Axtell
"Do's & Taboos of Preparing for Your Trip Abroad" by Roger Axtell and John Healy.
"Do's & Taboos of Using English Around The World" by Roger Axtell.
"European Customs & Manners: How to Make Friends and Do Business in Europe" by Elizabeth Devine and Nancy Braganti.
"Gestures: The Do's and Taboos of Body Language Around The World" by Roger Axtell.
"Traveler's Guide to Asian Customs & Manners" by Elizabeth Devine and Nancy Braganti.
"Traveler's Guide to Latin American Customs & Manners" by Elizabeth Devine and Nancy Braganti.
"Traveler's Guide to Middle Eastern and North African Customs & Manners" by Elizabeth Devine and Nancy Braganti.
Cultural Profiles Project
WorldWide Classroom: Culture Shock
"Shorts and T-shirts may be OK if you are just going to hang around beaches but throughout Asia your choice of clothing is seen as a mark of the respect in which you hold the people of the countries you are visiting. If you wish to be accorded respect then you should dress at least as well as you would at home." <Nigel Gomm>
I was treated better by locals because I followed Nigel's advice -- many told me that they noticed and appreciated it. I also wore light cotton pants the entire trip without it being too hot. Please look at the locals: in most places, they are usually wearing pants, not shorts, regardless of how hot it is. Many Westerners complain that it is too hot for pants; in Asia they will not lower themselves to correct you, no matter how offended they feel.