What most naturally follows?

How to stretch vinyl fabric
Acquire 2-way or 4-way stretching vinyl.
Not all types of vinyl fabric have stretching capabilities. If you plan on expanding your fabric, make sure you purchase 1 of the following vinyl variants from a specialty fabric store :
Two-way vinyl, which only stretches from left to right but is thicker and far more durable than 4-way vinyl.
Four-way vinyl, which stretches both vertically and horizontally but is far thinner than 2-way vinyl, making it more susceptible to tears. Place your vinyl facedown on a firm surface.