[IndianaSigKap]

Yes, not wearing heels is more than ok. :-) You will be on your feet a lot, so pick your shoes for both style and comfort. Boots and flats are definitely in right now. You are good to go. However, by the time you get to preference, if you want to wear heels you should feel alright doing so. If a chapter has invited you to preference, they like you. You stood out in a good way, so I don't think being amazingly tall with hinder anything.