Bear in mind that you have a limited amount of weight, if you’re the attendee probably less than your older sister did. And while you may count on sending stuff with people coming in for yom tov, bear in mind that your parents will want you to come home with any clothes in good condition, unless you’re B”H in a position to be able to leave things behind.
Keep it real. You will/should seldom feel underdressed (I mean re style, not tznius) in E”Y which is part of its beauty.
Hatzlacha!