Like most comic creators around the world, celebrated artists Gabriel Ba and Fabio Moon work from home. That doesn't require much in the way of a dress code, but for the past nine years the two brothers have celebrated the completion of major projects with a unique tradition: dressing up.

On Friday, they completed their next major project, the graphic novel Two Brothers, and to mark the occasion they wore suits. Dubbed "Suits Day," the tradition began in 2005 with Moon's second graphic novel Smoke & Guns.

Nothing is known about the upcoming graphic novel, past its name, but Ba and Moon have already announced their next project: the fourth volume of Casanova, subtitled Acedia.