My t-shirt displays

Last year, before I first went out to sell my t-shirts at an event, I had made two t-shirt displays from a long sheet of two-inch gray foam. I only had one t-shirt design, the 1.0, and it came in black or white. I didn't print any Smalls in white so when I went to go make the displays I was forced to use Mediums. One year later I'm still using the same displays but with more t-shirt styles. All is well until I realized that the Medium sized shirts sell faster than the Smalls. A couple times I've had to pull the Medium shirt off the display because it was that last Medium in that color. Now that I'm running low on inventory I thought it would be a good time to finally cut the foam displays down a size. If only dropping a shirt size in real life were that easy.