Finally! I have a dust cover for my Expression. My Mother-in-Law sewed this baby together for me this past weekend. I purchased the material from JoAnn's and we used the free pattern from the Custom Crops website.
I don't know a thing about sewing so she is going to make dust covers for all my machines. I will post pics when the rest of them are done. I don't think there are instructions on the free pattern at Custom Crops about how to do the piping (I think that is what it's called), but my MIL added it and it looks great!
Thanks for looking! Have a great day!