This looks like your standard bulky-yarn beanie, but just try to find the “seam” where the double-crochet rounds are joined. (Can you spot the joining stitches on the lime green hat? Hint: Check above the mannequin’s ear….)

I didn’t invent this method of joining -- basically you skip the ch and work into the first real stitch -- but I added a small refinement. I work a short-ish chain, which I think blends in better with the actual stitches.
Finished hat sizes are 20 in./51 cm, 22 in./56 cm, and 24 in./61 cm.

The pattern provides written instructions using American crochet terms.

7/29/2016 UPDATE
I’ve updated The Big Unseamly Beanie to match the format and style of my paid patterns.

The update has new photos and a Page 2 with all the information needed before starting the project -- sizes, finished measurements, yarn amounts, hook sizes, etc.

Other changes include

1. An increase in pattern pages from 2 to 3.
2. The beanie is now one length -- 12-in./30.5 cm with a wide, turned-up brim -- and yarn amounts are given for this length. (Though you may work to any length, of course. The shortie length with a small turn-up brim in the previous version was 9 1/2 to 10 in., depending on size.)
3. Increases are no longer made in the slip-stitch joins.
4. An extra stitch has been added for each size.
5. A couple of tips have been added, including the Retroactive Magic Loop.
6. Suggested hook size has been changed to 10 mm.