Is it harment when you are critized for dressing "too young"?

For two straight years, I have had a comment on my evaluation saying I need to dress more professional. I have spent a considerable amount on a new wardrobe, dress older than my age, yet I am still critized by one individual in a higher position. I found out today that she's upset because I wear jeans and a company t-shirt/sweatshirt on Fridays, even though it has been established to the entire staff that we are allowed to wear this on Fridays. In addition, I was informed that she thinks I dress "too young". She is the only one who has every complained about this and I feel that I am being hared by her. This, along with MANY other problems including intimindation and threats from my supervisor have forced me to quit my job to aviod further persecution. I have followed the "chain of command" to report these incidents with no resolution. What kind of action can be taken? Can I collect unemployment after I quit?