You can buy leather pants that are cut more like regular pants as opposed to a race cut (ie no knee sliders, not as fitted, not ergonomically formed). Don't know of any particular names off the top of my head, but if you check out JR, Alpinestars, or any other motorcycle apparel company I'm sure they will have what you are looking for.
Your other option is reinforced jeans. Icon makes a few pairs that are supposedly better than jeans.