As for all my previous phones, I made a leather pouch for the Jolla. Due to the "squarish" shape, it is very easy to do.

I used a cow leather, thickness about 2 mm and all the parts are glued with contact adhesive.

For this model, I did not make any flap on the opening so the phone remains visible.

If you want to try something similar, make sure that the inner part is 0,5 mm wider than the phone to ensure it's easy to take out

Here are some pictures.