>>1900719all pants will blow out from cycling
you should cycle in shorts. They're the most comfortable. If it's cold, wear thermal longjohns under the shorts, polyester, polypropylene, merino, or a mix.
I just get the absolute cheapest basic cotton shorts, with a drawstring. More expensive hiking / sport shorts tend to last a bit longer but the cost/ benefit ratio isn't really worth it.
If you want to wear long pants, buy them from a thrift store. Look for 100% cotton or wool pants, not cheaper stuff with plastic in it. That seems unworn. Then you aren't losing much when it blows out. If you find good ones in wealthier areas you can often get pants that were $100+ for like $5-$15