Iron the freezer paper stencil onto your shirt. Make sure to spend a little extra time on the edges.
Using acrylic paint and a foam brush, blot paint over the numbers. Allow it to dry and then do one more coat. Wait until the paint is completely dry and then peel off the stencil.
Dress your child in the shirt. It will be very large, but it needs to be, so they can still wear it in high school. Use a small chalkboard or a sign to state what year they are going into in school. I like to add the date too, but that is up to you. Years from now when she is a senior in high school, I am going to make a collage with all of the pictures from her first days of school. It will be a great project, but I am still hoping that day doesn’t come for a long, long time.