Got a local sewing Alterations biz, to taper the legs of a Charity shop pair of trousers,
they added ankle zips to make them easy to put on/off.

Black so sweat wont leave the 'brooks butt' stain like Khakis do ..

Often I just wear sweat pants. there are smooth finish fleeced compound knit fabrics.
Russel brand in the local big box, comfortable for older tubbies like me. look OK.(imo)

Portland's Clever Cycles gets an exclusive on wool pants cut for cycling,
sewn by a Non-Sweat LA company,
but they are up there in Rapha upscale price heights..
http://clevercycles.com/blog/products/apparel/#_