It may seem a bit daunting if you never tried it, but making a hat isn't very difficult. You don't have to work with hat stocks and steaming felt or straw- a hat can be sewn, knitted or in chrochet. And it isn't too difficult to find period patterns online. On Etsy you can find re-printed PDF-patterns for a few dollars. Printable patterns can be a bit of a hassle as you may need to cut and paste to get your pattern, but a hat is so small that you may not need to paste at all. Here are some of the 30's and 40's patterns that I like- there are more.
Pretty hat and posy made of leather
Three hour beret pattern
Cone shaped hat
Another stitched hat
Turban rosette hat
These are all hat that are sewn- I found so many in crochet and knits that they will have to wait for another post.