Get some cute yet sytlish eyeglasses(non-prescribed ones) though you can get prescribed ones if you wear glasses already.You can get them from Newlook £4.99,Amazon £4.39,ASOS £12.99,Primark,Claires,Topshop, Ebay basically you can get them from any shop online and offline depending on your budget.
Borrow the steriotypical Geek image but put some style on it..
Mix geek with other styles e.g. Emo,Preppy,Goth,Urban,Hippie,Indie,Boho but make it your own cause no one likes a copycat.
Wear fitted clothes with inside jokes from cult movies or books or try something sci-fi or computer related.
Mix classy and proffesional with casual
You dont have to buy a whole new wardrobe just mix up what you already have.
If your wearing a skirt make sure its knee length or shorter.
Knee high tights add a touch of style to a skirt.
Dont bother spending money on a fancy hairstyle if you want to look more geekier.
If you are wearing make-up make sure its not too much tone it down a notch but make sure the eyes stand out by using a bit of eyeliner and if your using eyeshadows make sure you use the natural palette otherwise other colours might make you look like a clown.