At my alma mater (LSU), fraternity pledges were required to dress up for tailgating and the game. I personally thought this was pretty cruel as these boys were often in suits and it was HOT HOT HOT outside. IMO, it borders on hazing! But that's not the point...If a new member of a sorority was going as the date of one of these boys, she was expected to dress up as well.
That was several years ago and now it seems like dressing up for the games has become more common for all students, whether they are Greek or not. However, the majority of the students still seem to prefer their "Game Day Casual" look
