Hmmm I have not printed on fabric with my current printer but I did do some fabric cutouts with my silhouette for my son's bedroom...I used the dinosaurs in my Dinosaur Rawr's kit. I used a iron on interfacing...you can get it here:
http://www.silhouetteamerica.com/?page=shop&cat=5
I had really good results and the fabric was a thick cotton almost denim.