1. I get 90% of my clothes from Uniqlo (similar to a Japanese version of the gap or j crew ). I highly recommend their wool like dry stretch pants. They look like wool are easily washable and are extremely light, dry quick, and pack small. Their regular khakis are usually a great bargain as well. About 20 to $40. Their sale section is a steal online, I usually buy them on sale.
2. Costco has their Kirkland signature gabardine wool pants for a more professional look. They are dry clean only and about $40. I do think wool looks much more professional than khakis and just as comfortabke. And this offers great value.
3. Lands end has fairly good quality as well although their regular fit is very baggy. They do have a !ore slimmer fit option so look for those. The fit here is a bit more conservative than stylish, a bit of a more 40 plus age look though....their signature line is bit more stylish but I found Uniqlo to offer much better value.