There is nothing better for stenciling than freezer paper! You can find it in your grocery store near the foil and plastic bags. All you have to do is cut your desired image out, and then iron the shiny side down to whatever you wish to stencil. Once you paint the image, the paper peels off easily.
Here's what I made this weekend. I have a few Georgia Bulldog t-shirts, but they're all short sleeved. I've been wanting one to wear in colder weather, but I'm so picky! I wanted a grey long sleeved shirt with just a simple logo on it. I looked everywhere for the perfect shirt, but finally decided to make my own. It only took a couple of hours to cut out the design and apply the paint. It was done and ready for gameday this weekend. Go Dawgs!
Here's another shirt stenciled using freezer paper. For this one, I used my Silhouette Cameo to cut out the type. Perfect lettering every time! I just use regular acrylic paints, and apply sparingly. After painting, heat set the image using a heat gun. Or, just pop the shirt in the dryer. I also like to wash the shirts before wearing, as it takes the stiffness out of the painted areas.