Begin by washing and drying your t-shirt and fabric pieces to prevent shrinkage after sewing.
Iron press each item to ensure smooth, wrinkle-free fabric.
Print the free pocket template from here.
Carefully cut out your desired pocket shape from the template.
Place the fabric pieces with their right sides facing each other. Place the template over.
Use your pocket template as a guide to trace onto the wrong side of one fabric piece with your fabric pen.
Pin the two fabrics then cut along the traced lines. A ¼ inch seam allowance is included on all sides.
Next, sew around the edges of your pocket with 1/4" allowance, leaving an opening on one side for turning it inside out.
Trim any excess material from the corners and turn your pocket inside out using a point turner tool to achieve crisp corners.
Press your pocket with an iron to remove any wrinkles and flatten the edges.
Optional: you can run a line of stitches as indicated in the template (the dotted line).
Place your t-shirt on a flat surface and decide where you want your pocket to be placed. Using pins, secure your pocket in place on the t-shirt, making sure you don't pin through both sides of the t-shirt.
Sew around the edges of your pocket, making sure to backstitch at the beginning and end for durability. Leave the top open if you want functionality in your pocket
Trim any stray threads, and voila! You’ve successfully added a pocket to your t-shirt!