This is a loaded question as there are many routes to meet the required 'weatered' look. Because of levels of weathering to outright destroyed. What level are you looking for? The csreen worn X1 jacket that's been sanded and the seams falling apart, complete with missing left stripe?
Just a few examples offf the top of my head:
There's the wash and wear method (either worn in the shower and wear til dry to achieve that well-worn for years look). Or you could use Isopropyl Alcohol(70%/90%) and rub off the shiny topcoat. Or you could go to the extreme with fine grit sandpaper and beat it up that way, or a safer route that is if you have the means, to media blast your jacket.
Or just do what Indy does....be dragged behind a tank and call it a day.
There is the longer safer way or the quicker more destructive and permanent way to achieve you weathering goals. If you have any specific questions, feel free to ask, as I'm sure there will be others to give there $.2
