I have a 6 month old so personalizing onesies are a favorite thing to make her clothes special! A friend of mine asked me to personalize some onesies for her twins' first birthday and I was thrilled. Because knits are a stretchy fabric I was extremely nervous on how I should proceed. Here are the steps that finally worked for me...
2. Hoop a single sheet of light weight tearaway stabilizer.
3. Place you grid on the design so you know where it will sit on top of your hoop. Spray the tearaway stablizier with a spray adhesive like Sulky Temporary Spray Adhesive and press the design that is facing up in the picture down on the adhesive and hoop.
4. Insert your hoop and begin stitching. Roll up the edges of the onesie so that they don't get caught in the way of the needle during the stitching.