Atari has announced the "Speakerhat", and it is just what you think it is... a Bluetooth hat with stereo speakers built into the brim. The Speakerhat has a retro appeal and the potential to become annoying in public.
https://www.notebookcheck.net/Atari-creates-a-new-wearable-called-the-SpeakerHat.236884.0.html