I taught myself how to crochet in order to create custom knit items. I couldn't wear store bought knit hats, as my hat size was a smidgen too big! Personally, I prefer the simple crocheted hats, ribbed brims or ribbed all over. Hopefully you, the potential buyer shares the same love of simplicity too!
For hat items, there will be all sizes available! Make sure to choose your right sizing.