while i'm not a nine to fiver, i would ignore the jeans advice.
no clue why jeans are considered more casual than chinos.
if this is for an office job, think inside of the box. wear the boring stuff: khakis, button down blue shirt, etc. dress as boring as possible.
as far as the creases in your bushacres - no clue. next time spend the extra $20 and get proper desert boots.