A few sugestions, if you are portaying a cowboy just off the trail. You will need your clothing to have that well worn look. The best way if to wear them, to that point. I mean wear them as often as possibale. Wear them doing the yard work, to the fishing hole any place your wife will let you realy. If methed isnt for you, try things like hang your vest over a shirt on the clothes line. This will make them fade reather well. As for as hole and such in your clothing, pacth them. Even trail hands on a drive did not let there clothing go raged. If someones shirt did get to the point it was unwearable, the parts that could be saved went in the chuck wagon. If someone else torn a hole in his, the scapes made patches. For make in some what new look well used, small patches help greatly. The patches should be faded and show less wear than the rest. This being becuse they where most likely made the tail of a shirt, or lower leg of a pair of pants. These part get almost no wear due to protection frombeing tucked in. Hats, buy a cheap one. I left mine in the old pickup for about a year. After being stuffed, sat on, shoved befind the and many other things it has that look of age. Strong tea work good to add some stains. Boots and other leather can be aged by rubbing with fine steel wool and acetone. Just remember that even small things can add up fast and give that faked look.
Firearms can be done in much the same way. Remove some of the blueing from the rub spots. Remove any clear coating from brass, rub it with a patch used to clean black powder. Leting the powder fowling set a day or some, clean with water and soap. A light coating of oil will leave it a nice brown.
I hope this helps in puting togther your look.