Note: You can substitute acrylic paint and textile medium for fabric paint.
Be sure that T-shirt has been washed and dried before decorating. Do not use fabric softener.
Place a cutting board, a thick piece of cardboard or a cookie sheet to act as a divider inside the shirt. Lay the shirt flat, then insert a sheet of waxed paper between it and the divider. This will keep any paint seepage from getting through to the other side of the shirt and will also protect your cutting board.
When applying paint to foam stamps, add a generous amount by dabbing paint on with a paintbrush. Don't use too much that it drips, but apply more than just a swipe.
Use alphabet stamps and black paint to write out the words "TRICK OR TREAT" across the front of the shirt, "TRICK" at the top left, "OR" in the middle, and "TREAT" to the lower right, using the photo as a guide.
Use candy corn foam stamps with white, yellow and orange paint to add the candy designs. Again, use the photo as your guide or get creative and place them wherever you like.
Use orange 3D fabric paint to pipe a border around each candy corn.
Set shirt aside in a safe place and allow to dry overnight.
Once completely dry, remove the cutting board and the waxed paper from inside the shirt.