Something from here maybe? https://www.atomretro.com/mens/tops/shirts/long-sleeve-shirts
I quite like some of those! Unfortunately the ones I like aren't available in my size. The search goes on.
@ltc started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Something from here maybe?
https://www.atomretro.com/mens/tops/shirts/long-sleeve-shirts