I know that it is NOT okay to wear the badge (i.e. pin) of a group that you don't belong to. What about the actual letters, though? I've seen cases where the boyfriend wears the letters of the girlfriend's sorority, and the girl wears the boyfriend's letters. I think each individual GLO must have a differing view on non-members wearing the actual letters
(i.e. Phi Gamma Delta's can't even wear their actual letters, it has to say FIJI)

(of course the wearing of another groups letters would nonetheless depend on the context--wearing the letters while drinking & cursing like a sailor would NEVER be okay).

Would this situation of the boyfriend-girlfriend be considered "perping" as a member of that group, since guys cannot join a sorority, and everyone knows this?