I have recently gotten into the sophisticated sexy look. Being in highschool I am surrounded by the teen version of "sexy".

The other day, my friend wore tight low rise jeans, and a tiny tight top with huge hoop earrings, plus glitter eyeliner. I wore a high waisted pink pinstriped pencil skirt, a crisp white button up shirt and light pink pumps. My hair was down in soft waves and my only make up was mascara and cream blush.
I had some people tell me I looked sexy, but classy, not trashy. Yay. I felt like such a grown up.
As for preppy, I just bought a sleevless pink argyle sweater.