So does that mean you won't ask me for the Sigma Kappa sweatshirt I'm wearing now?

Calm down folks, you'll notice that I wrote 'acting obnoxious and to give the frat a bad name' (or something like that, bit too lazy to quote what I said. =P ) And I put nicely in parentheses, and might I remind you that these are suggestions. Way to jump all over someone's words.

If you read some of the earlier responses, asking them nicely and then offering to replace what they're being asked to give up can actually work.

And again, these aren't just all homeless people who can't afford clothes. Non-members who wear letters can be regular people who are just clueless about what they mean and got them (who knows how... ) because they thought it looked neat. In that case, trying to explain everything to them is not a bad idea. And as shadowyi said, sometimes they could also just be jerks who are trying give your organization a bad name

i agree that there's not much you can do if it's just some random person. maybe approach them and ask where they got their shirt, and get back any other para that might be for sale. now, if it was someone on my campus wearing letters that didn't belong to them, there would be confrontation. that's completely disrespectful.