Hi Pixell!
Technically, lavalieres and letters are the same thing. Both identify you as a Delta Zeta. And, naturally, whatever you do when you're wearing either of them reflects on our sisterhood
If you're out partying or grabbing a smoke or otherwise not looking your "Delta Zeta best" (our CCD used to use that term; it cracked us up!), leave the letters at home and tuck your lavaliere into your shirt. That was what I did because I wore my lavaliere 24/7 in college.
Hope everything is going well and you're enjoying life as an Initiate!
DZLM,
Tracy