Tape. This is to hold the Winnie The Pooh And Lucky Clovers Saint Patrick’s Day Shirt in contrast I will get this stencil in place while you apply the paint. Masking tape works well for this purpose. Cotton t-shirts shrink in the wash, so it’s important to run them through the washer and dryer before you print on them. If you wait until after you print, the design might end up getting warped. When the t-shirt is dry, iron it to remove any wrinkles. Lay out some butcher paper or scrap paper on a hard, flat surface. Place the t-shirt on the surface and straighten it out so that it has no folds or wrinkles. Place the stencil on the part of the t-shirt where you want to print the design. Tape the edges of the stencil to the t-shirt to hold it in place. If you’re worried the paint is going to bleed, place a piece of cardboard inside the t-shirt; this will prevent the paint from seeping through the shirt to the other side.