My daughters had Dr. Seuss week at school and I had a hard time looking for Thing 1 and Thing 2 t-shirts at the stores. So I decided to make it myself! All materials were bought at Michael's. But you can also check your local crafts store.
Items that you need:
2 red youth t-shirts (I bought them at Michael's)
Brush-on Fabric Paint (White and Black purchased at Michael's)
A circular bowl
Take your circular bowl and place it on the t-shirt to where you want the circle to be.
Trace around the rim with your marker
When you are done tracing the circle.
Make sure you put a cardboard or a place mat on the inside of the t-shirt to prevent the paint from transferring to the back of the t-shirt.
Take your white Brush-on Fabric paint and paint inside the circle. (I did two coats)
Let the paint dry for a couple of hours.
After the paint is dry, take your black Brush-on Fabric paint and create a border around the circle.
With the black paint draw "Thing" on top of the inside of the circle.
Then draw "1" on the center.
Let the paint dry over night.
While the first t-shirt is drying. Start the second shirt.
Follow steps 1 - 4 but inside of drawing "1" on the center draw "2".
Let shirt dry over night as well.