Clothing should be simple, layered and of a neutral color.  Khaki, Green or Olive Drab work best. (A Khaki shade should be more of a medium rather than very light.)

Comfortable boots or walking shoes are a must.  Ankle high work great.  Be sure they are well broken in prior to arrival, as blisters can ruin a safari.  4 pairs of boot socks should be enough and bring an extra pair of boot laces along just in case one breaks.

Three changes of comfortable, cotton bush clothes are recommended.  I prefer long sleeve shirts as it can be cool in the mornings and as it warms up you can always roll the sleeves up.  Long pants protect you from the thorns and if you get the ones that zip into shorts you should be comfortable at any time.

Bring at least one warm jacket for those cold mornings and a pair of gloves.  I also bring an extra sweater along for the layering effect.

You will also need a hat for protection from the sun and branches while stalking.  The type you wear is based on your preference.

In the evening, camp is very informal.  As it gets cool, good choices would be a sweat suit or jeans and a sweater or sweatshirt.

Other miscellaneous clothing:

Casual clothing for use prior to and after your safari or for those side trips

Belt and a cartridge holder

Four sets of underwear

Comfortable shoes and socks for wearing around camp

The Chalet floors can be cool in the mornings and you might want slippers or shower shoes

Swimsuit

A lightweight waterproof jacket