@BrightEyedDyer My favorite go-to chemo/cotton hat is the Lace-Edged Women's Hat. I've made at least 10 of them. They are like potato chips!!
https://www.ravelry.com/patterns/library/lace-edged-womens-hat
@BrightEyedDyer it's knit from the bottom up, and I use worsted weight cotton to make the Small size. I cast on an extra st which I p2tog when I join to avoid The Gap.
I started the first one as a Med on the same cotton (first hat) and it was gigantic! lol
@kismatt Cute!! And I think I might have the perfect cashmere blend for that.