If you have the type of yard where you don't have to worry about someone disappearing with your kit, then by all means, hang it outside and leave it there... the weather will do a nice bit of aging, especially allowing the sun to fade the fabrics, turn it every day, simple but very effective. I also recommend sand paper where you lean your elbows upon the table, knees from kneeling, tail from sitting, and any other spots that would have been rubbed regularly whilst working... example, hems, cuffs, buttonholes... You can also sand down buttons that are bright and shiny. And there is nothing easier than "losing" a few buttons here and there...or mismatched buttons.
Experiment first with Bleach. A solution of Bleach and water, can be used to do a quick fade on linen fabrics.
One of Foxe's great suggestions at RF2 was to store clothing, between events, in a large rubber tub with a sample of tar... the fabric will pick up the scent in no time and holds it for long periods. We have grown so used to the odor that we no longer notice it, but kids at events will be more than happy to tell you, you stink... so you will know its working... Also, why not just tar items that they would have tarred?
Whatever you do, keep in mind the desired result, for once you "age" you can't make it new again.