One of the reasons it does look so wide is because the hat is made a couple sizes too large to fit down over the bandanna.
I was going with 3-1/4 -- 3-1/2".Just had Johnny on the phone & he confirmed the brim on this particular western was 3.5" including the roll. Hope that clears up any conjecture.
A pencil curl is smaller, tighter; like it was rolled on the radius of a pencil. A kettle curl is bigger, rolls over to be more rounded & rolled on a much bigger radius than a pencil. A kettle curl often involves a brim swoop also. DD & Moviehats both do excellent curls. Perhaps they can weigh in on how they make the differences.
John Lofgren Monkey Boots Shinki Horsebuttt - $1,136 The classic monkey boot silhouette in an incredibly rich Shinki russet horse leather. 
Grant Stone Diesel Boot Dark Olive Chromexcel - $395 Goodyear welted, Horween Chromexcel, classic good looks. 
Schott 568 Vandals Jacket - $1,250 The classic Perfecto motorcycle jacket, in a very special limited-edition Schott double rider style. 
Born to be a cowboy he was.
At least he didn't shave it completely off like he did when he played Sargeant Major Plumley in We Were Soldiers.
What's this "epitome" crap?
The Shootist. Also with Jimmy Stewart, Lauren Bacall, and little Opie Cunningham.
...who went on to star in American Grafitti which gave Charles Martin Smith his big break as Terry the Toad, who then went on to star as Ned Brookshire in Monte Walsh.
Sign of the times that they were active. I love Wayne but my top ten would also include Elliott, Selleck, Russell, Costner, Ben Johnson, the Carridines, the Keach's & it would be hard to stop at ten.
Sorry, I meant Streets of Laredo.
You should dig in and watch The Searchers, The Man Who Shot Liberty Valance, and a personal fave, Big Jake (Dog is my favorite character).