This is a slouchy version of the Slip Stitch Stockinette Beanie (https://www.ravelry.com/patterns/library/slip-stitch-stoc...). This version is VERY adjustable because as long as you cast on a multiple of 2, you’re set. The decreases are just k2tog, so there’s no math to figure out! I do suggest blocking the hat just to loosen up the slipped stitch fabric some, but it is not required to be able to wear the hat.