What you'll need:
1. Freezer paper
2. A plain white onesie
3. A stencil of your choice
4. Fabric paint
5. A paint brush or sponge
6. An exacto knife
7. A piece of cardboard that fits the inside of your onesie.
Place your stencil over a piece of freezer paper and cut it out with your exacto knife. I also used a circle cutter to make a circle around mine.
Put the piece of cardboard inside your shirt and iron on the stencil (glossy side down) in the correct spot.
Make sure all of the edges are ironed on really well.
Paint the stencil with your fabric paint.
It will take a few hours for the paint to dry completely.
I sped up the process with a hair dryer.
Peel off your stencil and tada! Look what you just made!
Easy as pie, right?!