What Should I Wear?

We all work for different companies who all have different dress codes so what do you wear to work everyday? Casual or smartly dressed? I can never decide what to wear. I work at a travel agency and we don't wear uniforms so sometimes I just wear a nice shirt and belt to do it up a bit so I don't look too "casual" but at times I feel I am not fancy enough. What can I do just to add that little extra umph?

Clothes can be so expensive and I don't earn the biggest salary. I have a unique fashion sense but it seems like I never have anything to wear, especially for work. Going out to party is never a problem but getting dressed for work seems like an huge unnecessary ordeal. Any advice would he extremely helpful.