How would this scarf be fastened? and age

[plousia]

This silk crepe scarf has an interesting feature, a small button and button loop on one side. I wonder if anyone knows how it would be fastened. Is there a special way of wrapping it then fastening the button to hold it in place? In the photos I just have it draped across the dress form shoulders and buttoned at the front, but I feel like there must be some way of doing it that I can't figure out. Google searches are no help. Maybe this is how it was supposed to be worn?

Also, I think this scarf may be 1930s; if anyone can confirm or correct that guess, it would be very helpful!