a legal hunting License and things being hunted in season!
after that I would say a GOOD brain in your head that has taken some time to LEARN the safe ways of hunting and the basic's(or advanced) behaviors of the game animal your hunting!
lack of common sense these days is amazingly SAD IMO!
knowledge as they say is power, and its a HUGE part of being successful at most ALL things in life, including hunting! learn your species your after and the more you know, the better your adds will be at killing one!
after this, you can wear what ever gear you like, higher end gear works better MOST times, as it normally has a specialized area its BEST in