Never wear flip-flops to school. These are considered bathroom slippers. Most schools do not permit their students to wear them to school either. Few to no Ghanaians will ever tell you that you are dressed inappropriately even though they might think it. Men find boxers are cooler than briefs.
Elastic self destructs in the tropics.
You may want to bring enough underwear so that you can put some up for your second year. The above list was designed to keep you from bringing too many clothes. As we said, the tailors and seamstresses are excellent and cheap. Don't call your Country Desk Officer because he didn't have anything to do with this list. The Army-Navy Surplus store is a great place to start shopping but DO NOT buy any clothes that appear to be military issue or that bear any military insignia.