My bruv once ran as a bandit many years ago, announcer called out "this guy doesnt have a number but he's lookin good!" as bruv hit the finish in 3 hours 1 minute. Hat tip. 1999.
Anyhow, performance gear by Tracksmith great and low key. Lots of old-timey stripes etc. Navy or crimson if you dont feel you have to drop the H-bomb...