DIY Iron Wool Mat Cover

I have a small wool mat next to my sewing machine to press seams as I make blocks.  I have a full size ironing board for bigger projects, but the wool mat has been a real time saver for me.  I have used a pillow case to keep the wool mat clean, but it bothers me how funky that looks.  I am going to love making a DIY case with pretty fabric from my stash, and it is going to make my sewing area look so much nicer!
​--Ann