My son got a real nice whitetail when we were out in muley country. He's 16 and this is his 5th buck in a row--his first whitetail, the others all muleys. 260 Remington, shot him at about 250 yards.
I passed on a few bucks out in muley country (not too interested in the 2 to 4 mile pack out unless it's a big one!) and last weekend of rifle I took the ol' iron sight thuddy-thuddy out and got a tender little doe.
Well to answer your question the orange is to protect you from other hunters mistaking you for a deer or just making it more visible where hunters are. In some seasons such as archery deer you are not required to wear orange but other seasons such as rifle you are. We dont have as much room around here in the states like you do in Africa. They say the deer cant tell the difference anyway!
Actually, it's the law most everywhere although some states require more cubic inches than others. IN North Carolina just a cap will do. It is for hunter safety and supposedly deer, elk, etc. are color blind.
It doesn't seem to be a big detriment as far as I can tell.
Top picture is of wife with her 6pt and doe she got 20 minutes apart on the evening of opening day rifle season. The middle picture is of her nice 8pt the second day of primitive firearms season. The bottom is of the youngest son's 9pt he got 1 week after his mother's deer.
As for the orange, her's was in the truck, pictures taken after dark and he still had his cap on, but vest was in my truck, I forgot camera so I didn't get field picture.
The orange is so some ding dongs who shoot at movement, it happens, hopefully can see me or my family member and not mistake the "orange deer" for a real deer.