The first thing you'll need to do is gather your materials. You will need the following:
pair of scissors
sewing tape measure
Sharpie for marking cuts (not pictured)
needle and thread (optional)
sew-on velcro (optional)
When choosing a t-shirt, it is best to pick one that has a neck roughly the same size as your dog's. That way, you won't have to deal with cutting the neck down to fit or worry about cutting off Fido's air supply.