Official Logo Shirt of British band Archive. I bought it during their 2015 "Restriction / AXIOM Screening" Tour.
I know it's not exactly metal, but the shirt is part of my collection and I also strongly believe that there are at least some metalheads who like the band. ;)
I bought this shirt at Archive's show at Substage in Karlsruhe, Germany, on 21st March 2015.