Hey! At my school the Greek system helps with freshmen move in, maybe you could talk to the campus and see if your fraternity why wearing letters could help move freshmen into the dorms during move in week. It's a great way for you to get your letters out there and seen.
Also maybe set up a table out side of the different dorms, not pushing ur fraternity, but giving out free water bottles or food during move in. If you wear ur letters during this, it could be another great way to get your house out there!
Hope that helps