I think the ban on commo's are one of that old laws on the book that is not enforced anymore, comes out of the old law that nobody may posses an army uniform or kit without permission.

It is high fashion for the kids in RSA to wear cammo clothing. I never had a problem with the cammo clothing I wear when I hunt. Two large cammo manufactures Cammo Joe and Snipers Africa's product are for sale in most gunshops in RSA

I know for a fact that cammo's are illigal in Botaswana, not sure about Zim.

You will be safe in RSA with cammo's, although I will not recomend army style cammo's and please don't look like a mercenery when you arrive.