Penguinista Red Star Cap
Ok, so we know it isn't a beret but that doesn't matter. What's important is you are fighting the power by wearing this ball cap. (Well, if the power is proprietary software and their evil-doings.) For female hackers, men will think you live on the edge of software freedom, and men, the ladies won't be able to stop picturing you as Che Guevara, leading geeks to the promised land. Fashionable flexi-fit completes the revolutionary look.