Here is how to make it:
Buy a piece of knit that looks like a sweater knit, 150cm wide. Mine was an end of roll 70cm length. Most people not vertically challenged like me would need 80, 90cm or even a metre. Serge or zig-zag all the raw edges. Fold it over, leave a 30cm (12") opening for your head. Sew the rest of the seam closed. Voila!
A wrap you can scrunch into your bag. Here's a closeup of the knit.
Happy sewing. Georgette dress adventures to follow.