What is appropriate clothing for an African Safari?

Most people preferred khaki shorts and polos. Also any color that camouflage with the safari wildlife. Anything comfortable as long as the color doesn't caught so much attention for the wild animals.

Wearing "Hollywood style" and/or camouflage outfits. Normal non-synthetic, comfortable fitting, neutral coloured clothes are what you need to be taking with.

Bright coloured clothing should be avoided and white clothes will show up dust and dirt. Red makes you very conspicuous to the wildlife especially on a walking safari. Khaki, brown and olive colours are ideal.

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Dress in comfortable and casual clothing. Avoid any fine jewelry. Don’t wear white clothing as it will make you more visible to wildlife. Also avoid red because it will frighten the animals. Khaki, olive, tans and browns are the best color choices. Select cotton clothing because it is comfortable and allows air to circulate. Take care of your feet and wear leather boots. Also wear a hat to protect your head.

Source: http://www.kruger-2-kalahari.com/safari-gear.html

 Here is a packing list with some details of what you must take to Africa for a safari  or even a gorilla  trekking tour

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  Gloves
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  A warm cardigan
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  Thick trousers and a long sleeved top are ideal for tracking.
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  Rain Coat
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  Video- filming is allowed in the parks though not outside the park
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  Water proof container for their cameras
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  A pair of binoculars if you are a keen bird watcher.
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  If you prefer wearing a hat, a baseball cap is recommended