RE: What are clothing regulations for shooting?
If you mean during the hunting of game? The only set regulations required are the required safety colors established by the various state game and/or federal game commissions. Usually this is the amount of and color of safety blaze orange that you wear. This is not optional, it is the law. Beyond that, the rest is up to you. And that rests on your comfort, ability to travel and protection from the elements. Some clubs may have even more restrictions than the game commissions but never less. And your options on what you wear are infinite. Just go to any sporting business and look around.