Anyone want to be my personal shopper? :D

EngineerPrincess

I'm looking for clothes for graduate school/ engineering industry interviews that I'll have in the upcoming year. I really want to look nice so I can feel more confident about myself, which will lead to less tripping over words and shaking. I'm fine when choosing cutsey girly outfits like dresses, but clearly that's not going to cut it for this.
I want an outfit that flatters me yet says "although this girl looks about 17 and possibly ditzy, she is coming across confident and capable in this interview, I believe she is a useful engineer."

Outfit suggestions? Stores? Links?

(PS. I have dark hair, light eyes and I'm 5'8 and 120 if you want to know.)