Don't discount his advice about culture, finding people who culturally fit is important and if they are using dress as an indicator you don't want to fail it.

Don't discount his advice about culture, finding people who culturally fit is important and if they are using dress as an indicator you don't want to fail it. The advice I have heard is to ask the hiring manager. If they say they don't care feel free to wear a suit, however if they say something like "nothing too formal" listen to them.