I am trying to find stretchy black cloth, Similar to the one used in the prop where a guy "pops" out of a tv screen but isn't actually coming out?

Spandex?

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Lycra or Spandex. Check out the swimsuit linings at JoAnn. They should have it in black. They also sometimes have thicker material.

maybe its not spandex but very stretchable. There wa sa prop of a tv with black cloth and very stretchy material

The only other material (besides lycra/spandex blends) I can think of is stretch fleece. I am pretty sure the TV used spandex though.