one level of fobs wear trainers with dress trousers ...the tight yet pleated shiny polyester pants with basketball shoes with 5 colours is of course a no no :D another level of fobs thinks that its simply can not be done.
it depends on the pants and the type of shoes. u can have dressy linen pants and rock em with vans or jack purcells anyday etc.
and then u must have seen the modern cut pants or even suits worn with the low profile, monochromatic, sleek sneakers as well. but not everyone can pull it off.
Justin Timberlake!............. I heart! :-)