I think I can safely say that LGLO members do not allow anyone else to wear their letters. I know that some of us will not even write another organization's symbols on a flyer or t-shirt (we'll usually just spell their name out, unless they give us permission). Everyone in my family knows that items with my letters are "off-limits." Also, in many of our organizations, one may not wear the letters until she/he is officially a brother or sister. Actually, I don't personally know of any LGLO that allows prospective new members/pledges/etc. to wear letters before crossing over. I could be wrong.