Hooded Shirt: Pest Horn / Data pirates (yellow)
In commemoration of the times when using a modem was still a punishable offence and speeds >300 baud where "physically impossible". Today still one of the inofficial logos of the Chaos Computer Club (no e.V.)
Best silk screen printing from local Bielefeld (!) production. Front and back carry the logo. Black sweaters have a silvery-white logo, the yellow ones a plague-black one.