Right now, my only casual pants other than my RRDS are a pair of thrift store corduroys, kind of a basic brown color. Baggy, very wide wale, very casual, comfortable, and good for skating.
I have a pair of cargo pants but they are seriously shit and they're already in the "donation" bag.
My next casual pants purchase will be a pair of nice black straight leg jeans, probably Nudies because I know what size to get now. I bought my RRDS as 30s and they're way too baggy, to the point that I washed them today just to try to shrink them, so I think 28 will be the way to go for Slim/Super-Slim Nudies.