Right now school supplies are on sale. I bought the plastic dividers for binders (not the ones with the folders these are just plain clear matte plastic)
I think I got a 8 pack for 3.50 at walmart.
You place the paper template on a table and tape it down. Then draw the template on the plastic and then cut the plastic out.
Then trace around the template on the fabric
Also if you are only going to use a template a few times you can use card stock paper its heavier but because of paper it will lose its accuracy after you trace around it a lot of times