You tend to buy a LOT of stuff your freshman and soph years... party favors, party pics, t-shirts for each and every occasion, lots of letter and crest items, etc., but you soon find that you are buried in stuff and slow down a bit junior and especially senior year. Budget more your first years in the group, and when you take on a little sis.
In our chapter, we did a lot of swapping of semiformal/formal dresses around, especially when we were going to fraternity parties, so didn't necessarily have to buy a new dress in order to wear a "new to us and our date" one.
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