This Friday is BBC 6 Music's sixth annual Wear Your Old Band T-Shirt To Work Day – a day on which music fans are encouraged to (would you believe) wear their old band t-shirts to work.
To shamelessly jump on 6 Music's bandwagon, we'd like to see your best band t-shirt. Send us a picture via GuardianWitness, using the 'contribute to this article' links above and below, or download the GuardianWitness app to your smartphone from iTunes or the Google app store.
Tell us a little bit about why it's your favourite, where you bought it and what it means to you – and we'll feature the best in a gallery here on theguardian.com/music.
While you're at it, don't forget to tweet your picture with the official #TShirtDay hashtag.
• GuardianWitness is the home of user-generated content on the Guardian. Contribute your video, pictures and stories, and browse news, reviews and creations submitted by others. Posts will be published on GuardianWitness, and the best pieces featured on the Guardian site.
