I love this cap. I know it may take some getting used to for some. I can hardly believe I am not brave enough to wear it out yet. I rarely have that problem. I remember my Aunt Mildred wearing one similar. I don't know what they are called but I bought this one on Etsy and it was labeled '1960's Glamour Cap'. Perfect for bad hair days or if you are setting your hair for an evening out. A lot of women used to go to the beauty parlor each Friday. Then they were ready for the weekend. The goal was to try to maintain your hair do until the next Friday-sometimes sleeping with your head hanging off the edge of the bed to keep from un'do'ing it. Washing your hair wasn't necessary so by Wednesday or Thursday you needed a cap like this.
I also have a slight aversion to the late 60's looks. Early 60's is close enough to the 50's styles. So here is the funny game I play with myself to justify a hat like this. I began dressing vintage 20 years ago. A lot of post war clothing, say 1948. Now 20 years have passed where would I be? 1968 of course! and in this cap.