Ingredients: Patch {This Instructable uses a patch that I make and sell}. Needle {Size 10 "Betweens" work well for attaching patches}. Thread {48" for a 2.75" round patch, thread doubled for extra strength}. Thimble {Make a
Duct Tape Thimble if you need one}. Base Garment {This Instructable uses my son's hoodie}.
It's your patch, put it anywhere you want. But to place a patch over your heart, or in the standard Name Tag Zone: Find the midpoint on the front-facing sleeve seam. {See the thumb in picture}. Draw a guide line towards the center of the chest that is perpendicular to the [imaginary] zipper. Find the midpoint of that guide line. That's your center.
Pin it if you need to.