We don't allow anyone who is not an initiated to wear anything in reference to Pi Delta Psi, especially Greek Letters. Additionally, only brothers are allowed to do our call or our hand sign.
I think Jubilance1922 makes some very good points. Just because the process/protocol is different doesn't mean you need to tell us to "suck it up". While people make good points, what about comprimising and using just the Council Crests?
At GW, when we were designing the Greek Week T Shirt, I told the other council presidents that some people didn't want other people wearing their letters in that fashion. While some people thought it trivial, the other council presidents respect the decision and we went with crests. And the T shirt looked hot.