For plain t-shirts try YMC. Sumo has a few and they're really nicely cut/made, although pricey if bought full price.
@Scoot started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
For plain t-shirts try YMC. Sumo has a few and they're really nicely cut/made, although pricey if bought full price.