Casual, comfortable clothes are recommended. It is good to travel light. There are no extreme temperatures in Tanzania, except at Kilimanjaro Mountain where the temperature will be around 20C at the bottom while at the peak it is below 0C with snow. Casual wear advisable, shorts are quite ok. Khaki wear, whether short or long, will be ok for the entire safari. If you are planning to do a guided trek in the park, walking shoes will be needed. In short, khaki shorts and long, a cotton shirt preferably in brown colour with multiple pockets (some routes are quite dusty), will do. Hats, sunglasses, may be needed, individually. Insect repellents are recommended, especially if you intend to spend sometime outside the ten/lodge to enjoy the night sky.