business trash
a style of clothing generally worn in a business or professional setting, that contains elements of traditional business wear assembled together with distasteful or poor quality clothing, which to the wearer, still gives a professional and businesslike impression, but in fact gives a trashy impression of the wearer to everyone else.
An office worker with a mullet who wears a golf tee shirt with a monster truck image on it along with khaki pants, a sports jacket, and faux alligator shoes is sporting the business trash look.