For safari in South Africa, more than the color of your clothing (pants and shirts) is that your game drives are done in open vehicles, so you better be prepared for cold and windy, regardless the season. Do pack a scarf, gloves, socks and at least a heavy fleece, sweatshirt or windbreaker and have a thermal-t.
We've seen few people decked out in "typical safari" clothing - and the few who were, everyone else thought they were staff at Singita. Most other guests wore whatever they wanted - jeans (every color), khakis (every shade), shirts or t-shirts in every color one could imagine, and the same with shoes. So apparently whatever is "recommended" went right out the window at Singita, as well as, at Honeyguide, a very rustic camp at one-third the price, where we spent the earlier two days. Nobody "dressed" for dinner at Singita; women might have added a colorful scarf to nice casual slacks and sweater, some of the younger women wore little "slip dresses," one man had on a sports jacket, most others simply wore slacks and a shirt.