I'm going to let you guys in on a little secret. I wore a polo shirt about 75% of my time at AMF, which was pretty much the entire time I was CVG based. CVG was doing Adhoc when I first began flying out of there and we wore polo shirts. When the Adhoc ended, there was an announcement made that we were to go to wearing the pilot shirt and I never actually "transitioned" to it. I continued to wear polos for the next four years. Whenever the boss was around, I wore a fleece zipped all the way up (learned that trick from one of the BFI ACP's). He knew I didnt have a pilot shirt underneath the fleece, but respected the fact that I wasn't openly defiant. The base manager just didn't care. All he was worried about was that the cargo got where it needed to be on time.