I'm looking for a comfortable, stylish, and professional new wardrobe for a job at a college. Help please?

I'm starting a job at a private college. My personal style is comfortable and casual - I'm a jeans and a tee shirt kind of girl. What can I wear that still feels like me but is professional and stylish? I am tall and don't normally wear high heals, and was told to dress nice but not too nice, just a step above normal student wear. No jeans but also no business suits. Pictures appreciated. It's been a while since I've gone shopping for a new wardrobe!