Looking for sewing pattern

Thanks! I had found that but couldn't figure out the entire width of the fabric (3X back) I'll give it a try with newspaper!

Directions and diagrams... https://yoelijocoser.com/diy-como-hacer-un-chaleco-con-un-rectangulo-de-tela/?utm_source=facilisimo.com&utm_mediureferral&utm_campaign=facilisimo

Translation:

Do you want to make a vest like the one in the photo? Nothing easier, you only need a rectangle of fabric with two openings for the arms.

Here is the outline of the pattern:

The measures that appear in the graphic, to make the vest, are only orientative.

Take the openings for the arms (red lines) 20 cm long and about 15 cm from the top edge. The gap between the two openings must be equal to the size of your back width.

The overall width of the vest will be (approximately) 3 times the width of the back.

You can vary the length of the vest to your liking (in example 70 cm).

To achieve an effect similar to the photo, you need to use a knitted fabric with enough body and elasticity. But you have many more options, depending on the type of fabric you want to use.

Here's an example: a loose knit fabric and a fantastic result