Joined the Purse of the Month Club

I was just hired as an accountant fresh out of college.  I want to make sure I present myself in professional attire.  There is plenty of room to grow in the company and they always promote from within.  I am investing in a new wardrobe, but cannot afford to buy everything at once.  I figure I will take about $100 from each paycheck and put it toward new clothes.  I just joined a purse of the month club.  I also need shoes.  I only have two pairs of dress heals that are appropriate for my office.  Right now my wardrobe consists of jeans and sweatshirts so I am not even sure how I will make it through my first week.