[ForeverRoses]

When I was in school (way back when), the groups that were strictly honor societies didn't really wear letters. I was in AERho and Alpha Lambda Delta, but never had any clothing with those letters on it (ALD did give us some sort of pin, but I have no idea where it is).
However we had service oriented greek orgs as well as major specific orgs (pre-law, business, etc.) and all of those did wear block letters/jerseys/hats. In some cases, those members were more "die hard" than those in the "social" groups. I remember one business frat hazing their pledges and thinking that if we had done what they were doing, we would have been kicked out in a heartbeat (they had their pledges blindfolded and were taking them on a "trust walk" around the building- up and down stairs, etc)