With a little creativity, you can make your own custom cut tee shirt in about half an hour. Buy a new, blank tee shirt from an arts-and-crafts or clothing store. Look at pictures online for fun design ideas.
Lay the shirt flat on a smooth surface like a table. Smooth as many wrinkles and folds as possible. If you cut a wrinkled shirt, you will get a jagged cut and may ruin your design.
Draw a design on your tee shirt, starting at the neckline. For a simple, feminine design, cut away the tee shirt's ribbing at the neck. Cut the shirt along the seam line. Cut the front edge into a scoop for a low-cut shirt. Mark the sleeves where you want to cut them. If you remove the ribbing and seams, the edges will roll up after washing.
Cut out along your sleeve marks with a sharp pair of scissors. Try to keep the edges as smooth as possible. Use a razor knife on a cutting surface for intricate designs. Trim any rough edges so they are clean and straight.
Iron the edges of your cuts under 1/2 inch to create a hem and keep the fabric from fraying. Secure the ironed hems with a little fabric glue.
Add embellishments. Write your favorite phrase with a fabric marker, or apply beads and buttons.
Wash the tee shirt as usual. If it wrinkles or rolls up too much, iron it flat. Use a large men's tee shirt for a soft nightgown, cutting away the sleeves and hems for extra softness.