This is from the Folkwear pattern #253 the Vintage Bathing Costume which can be found elsewhere at this blog.
I used the same cotton fabric as the bathing outfit.
You can see the bonnet tied tightly where it's supposed to be tied and there is a photo showing it tied low just so that you can see the tie better. You will also be able to see that there is plenty of room for hair. I can tuck it all up inside the snood/bonnet.
There is also a photo of the inside.