Hi Lori!
This is a HUGE question. Each country and tribe have their own traditions and customs. What is acceptable in one area is not acceptable in another.
For example, what I may wear on a trip to southern Nigeria to visit my husband's family (Igbo) may not be acceptable in northern Nigeria where the Hausa tribe lives.
So the best thing to do is to first get a travel guide book for the area you are planning to visit. The second thing I would I would do is find out the major tribes living in that area and read up on their customs and traditions to find out what is acceptable and unacceptable.