Ha! Great idea; this is a fun list.
I'd say:
1. khakis and a polo or white button-down is appropriate anywhere on any campus for rush.
2. Under tips to impress, mention to whomever is talking to you what in particular you like about their fraternity (i.e. "I notice you won intramurals last year; that's great because I like to be on a winning team and I can play ____")
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