A vendor displays three soccer jerseys arranged showing the numbers 11/11/11, in Jakarta on Nov. 10, 2011. (BAY ISMOYO/AFP/GETTY IMAGES)

Corduroy, naturally. 11-11-11 is Corduroy Appreciation Day, due to the date’s resemblance to the vertical lines of corduroy fabric. Corduroy aficionados are donning their wales — that’s what the ridges in the fabric are called — for corduroy parties across the country, and members must wear a minimum of three clothing items made of corduroy. The Corduroy Appreciation Club calls 11-11-11 “The most important day, EVER,” and the club was seeking an 11-year-old child who will turn 11 on 11-11 to crown him or her “the messiah of corduroy,” according to the New York Daily News.

The Corduroy Appreciation Club, which aims to advance “corduroy awareness,” is a social club with secret handshakes and rituals, and meetings to honor exemplary stewards of the corduroy fabric — among them, Vahram Mateosian, the tailor of the corduroy suits worn in “The Royal Tenenbaums,” and Christopher Lindland, the inventor of Cordarounds, horizontally-striped corduroys that the company’s Web site claims are more aerodynamic. The society will be honoring other corduroy-wearers at its event tonight, which will feature an 11-person band and will end promptly at 11:11 p.m. — of course.

Last-minute shoppers in the Corduroy Appreciation Club looking for an auspiciously-priced outfit for tonight’s bash: Check out these $111 skinny ankle-length corduroy pants by Maison Scotch.