wool felt scraps (I prefer 100% wool. It tends to be more expensive but washes with much less pilling)
Heat and Bond or other fusible interfacing
Step 1: Cut pieces from wool felt. Before cutting the body, eye stems and horns, follow package directions to apply fusible interfacing.
Step 2: Cut small squares of interfacing for the eyes and mouth pieces. Iron on per package instructions. When you are deciding on monster "accessories" keep in mind that you'll want at least two different color combinations of each facial feature in order to mix and match. The boys helped me to choose which colors and mouth features they wanted for their monsters. I find they are immeasurable more excited about a piece of clothing if they get to make choices during the project.
Step 3: Iron the body, horns, and eye stems to your shirt per the interfacing package directions.
Step 4: Sew around the edge of each piece in order to applique it to the shirt. For the eye stems, I made three rows of stitching.
Step 5: Cut a positive/negative piece of Velcro for each facial feature and each place where you want it to attach. Sewing a rectangle around the outside edge, attach the all of the positive pieces to the monster body and the negative pieces to each "accessory".
That's it! You are now able to mix and match to create a new monster each time you wear it. One note: if you have a clothing sensitive kinda kid (like my middle one) you may want to be sure they wear an undershirt underneath or place a piece of fusible-cut away stabilizer behind the shirt when you sew on the Velcro pieces.
Here's just three of our monstrous creations. My oldest two thought this was such a great idea, I've been commissioned to sew two more. Next time around we'll play with the body shape. Personally, I've always been partial to the "Monsters Inc." monster type.
One word of warning, the line between the monster's facial features and one's own, may begin to become confused.
The boys and I would get a huge kick out of seeing your monster shirts, so please feel free to e-mail me with your photos.