The Beaufort wind scale allows sailors to estimate wind speed; at 19-24 mph (a "fresh breeze"), waves are topped with whitecaps, and foam begins to spray from their peaks. (For those landlocked, small trees sway!) The color and pattern of this hat remind me of billowing whitecaps, and the yarn—a cotton-microfiber blend—is suitable for a chilly afternoon on the water, even in mid-summer.
"Beaufort" uses 2 balls of Jo Sharp Desert Garden Aran Cotton for the small or medium size, which will fit a small-medium child, and a medium child-medium adult, respectively; the large size requires 3 balls. The crown decreases are worked quite nicely into the stitch pattern, if I do say so myself.