HELP! I Got My Girlfriend Ugg Boots and a Ugg Skirt For Her B-day, How Can I Complete The Outfit?

I bought my girlfriend the Ugg clic short boots in sand and a Ugg skirt in the color sand. Should I keep the boots or get her the clic tall, or Bailey on boots or one of the sand colored knitt Ugg boots. Also should I buy her tights or leggings? If so what color? What style and type of top should I get her? Im trying to get her a complete outfit for her to wear. She's gonna be 15 this saturday.