Tax credit for work attire...?

I work for a hotel and am required to wear a certain criteria of clothing, not items I would normally wear outside of work. Clothing such as pencil skirts, blouses and blazers. Very neat looking. How ever my employer does not supply a uniform or anything so I am left to buy these clothes myself. I have heard that you can get a tax credit for doing this but that it is not that simple and that the required work attire has to be along the lines of something like what a nurse or somebody would wear and that regular business attire does not qualify? Also my employer is not keen on reimbursing. My question is how do I go about claiming my work clothes , if possible, on my taxes and is there a cap on the amount that you can spend/claim?