There are few companies outside of the firearm/defense industry that take a stand on the RKBA. Many companies have CEOs, and other high ranking officers that donate company money to anti-RKBA orginzations. For the life of me, I don't know of any major clothing manufacture that is pro gun. Though a few clothing manufactures do target outdoorsman in advertising.
Now about jeans, I tend to buy Lee jeans, and Carhartt not because of any pro RKBA stance but I found those too brands make good quailty jeans that last longer than Levis. Levis use to make great jeans but do to the current trend of poor quailty I stop buying them.