That's not as simple a question to answer as you might think. Material used varies not only from brand to brand but between different clothing from the same brand. I've encountered many clothes by the same brand that were all made of different materials and combinations of materials. For example, I was looking at clothes at the store last month and two different racks had similar pairs of pants, both the same brand, but different prices because the pants on one rack were made of different materials than the ones on the other.
So, my advice would be to just look for pants at the clothing stores in your area and check the materials on any that seem like they might be suitable. Also, try them on. The materials don't always adequately convey what the clothes are actually going to feel like, especially if they're mixed material. You might find something surprisingly comfortable despite what materials it has listed.