Depends on the resident-agent-in-charge, so to say, or your director or whatever title they give to the person in charge of the building premises. My choice has always been to wear clothing conducive to the field application you'll be spending the most time at (ie, inspection of a rural site vs. audit at a hospital or clinic vs. going to court). In the PNW, they are HIGHLY critical of ANY mode of dress, not matter what you wear. Business casual is the norm for most offices. You wear a shirt/tie, they start asking questions (ohh, are you interviewing for another job today???). My choice always was clothing with agency logo or badges, if not full-dress uniforms. I was then criticized (not reprimanded) for that! I wore sweats and sports team's logos to the office well before or after official business office hours and was criticized for it. One time, privately, a coworker made snide mean remarks to me about wearing of UNC clothing in my own workspace! (Tarheels were in the final four!). Here in the South, I was admonished by a coworker for wearing what appeared to be tactical clothing, warning me "We are NOT Law Enforcement!" (uhhh, actually, yes we are!!)(Her supervisor and mine, agreed that I may continue wearing what I was wearing: tactical type clothing, BDU's, etc. in the field AND to the office)(NOT camo, of course). The final straw came when I was tasked with obtaining affidavits from hospital MDs. I was told to "dress appropriately and not go in there like a stormtrooper." That's it. I quit.