How do you feel when people who are not in your Frat/Sor. wear your letters?

[MysticCat]

So here's a twist on the question --

A few weeks ago, Ms. MysticCat (a Kappa) sat down to supper wearing a Sigma Chi Derby Days tee-shirt that she has had for over 20 years. (She wears it a lot as a work-around-the-house type shirt.) I expressed some amazement that the shirt was still wearable and admiration that she could still fit in it, noting that I have a few Phi Mu Alpha jerseys (with block stiched letters) in my closet that I certainly can't fit into but wouldn't think of getting rid of.

Quickly, MysticCat Jr. -- a tall 6-year old -- shot his hand up and said he wanted them. (He loves wearing my old shirts). I told him sorry, but I couldn't let him wear these shirts.

"Really? Is that a rule?," Ms. MysticCat asked? I told her that I wasn't sure if it were a rule per se or an unofficial policy or just common practice, but that it would certainly be unusual to let a non-Sinfonian wear the letters. But we both agreed that certainly no one would confuse a 6-year old boy with a fraternity member, and the coolness of wearing the letters might plant a seed with him.

So what would y'all do?