Mine also wears red, but requires them to be "Crayola red" and "badge dress". I recommend not doing it that way...it's very hard to find that exact shade of red on a dress that is flattering and cute but meets very specific requirements. Girls often end up in unflattering dresses. Red dresses with more leeway would look great. On our campus the other chapters either wear white or black for Preference, so it's nice to stand out.
