For a different approach score area of the fabric that will become the crease before you even fold it over.
Iron vinyl fabric fold.
I made mine a wee bit too small.
Creative possibilities are endless with heat transfer vinyl.
To do this mark a line on your fabric where the crease of the fold should go.
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It is always important to let the iron heat up before pressing this way you will know from the start whether the iron is too hot and can avoid surprises like the iron heating up halfway through pressing and melting the fabric.
Make sure to keep the edge of the iron on the folded edge of the fabric and not on the vinyl itself.
Repeat on all four corners.
See the steps outlined below on how to iron vinyl fabric.
Sewing vinyl like sewing with other fabrics can require seams to be pressed in a certain direction.
Then using the end of a small screwdriver gently score a line on the fabric all along the intended crease.
The first thing to note is that you need to make sure neither the hair dryer nor the iron comes into direct contact with the vinyl material.