You need to look chic and professional, but still have a unique style. Watching What Not To Wear will give you great ideas.
First you need to figure out your body type, and then dress according to it.
To avoid looking like a teenager or grandmaish...Do not wear baggy jeans, graphic tees, converse, outdated clothes, baggy tees, sweats, ugly shirts, or bland prints and colors. Always have clothes that fit, do not have any holes or obvious things that should mean it should be thrown away. Also, do Not dress really slutty. No overly cleavage shirts, no really short skirts.. you know, the obvious stuff.
Be creative with colors.. Do not dress head to toe in one color. Have neutrals, and then add pops of color all through out your outfit. Also add textures and prints to your outfit.
Wear heels, sandals, and flats.
Accessorize!
