Line jackets?

[sjsoffer]

This is probably a really dumb question, but I've never heard of line jackets before, and on joetogas.com I saw that you can get them for any organization and I stupidly ordered one, not realizing they had to do with specific organizations. Now, I'm trying to cancel my order, but if not, would I terribly offend people by wearing it with my sorority letters?

(It has ASA down the side and "alpha sigma alpha" on it, but nothing else, no number or dates or anything.)