Study the Master
If you want to see what the most successful school store looks like and gather ideas, go the the Notre Dame Book Store. This store has the highest per square foot sales of any (!) store in the country including Tiffanys, Bloomingdales, etc.
While KP doesn't have the following of ND, there are a lot of ideas there such as jewelry, polar fleece pullovers for women, etc. that would boost KP's sales. I suggest studying what they offer, see if you can find out what that best selling items are and see if it can be worked into your inventory. There are lots of females grads, moms, gf, etc. that would like to see the offerings expanded. And remember, women buy most of the stuff men wear, so go after the women.