I have no problem showing off my letters. I recently bought a hoodie that I bring to work with me just in case I get cold. I always wear a lavaliere when I go out, and I sometimes make it a point to wear letters when I go out in public in the hope of sparking a conversation (works too).
I've been out of school for 2 years now, but am still involved both locally and nationally.
I agree with you LABlone, we should all wear letters more often, and there should be more "adult" Greek-wear