Size tags which survive many washings are significant too so buying more of the same brand doesn't require visiting a fitting room.
I'm fond of my favorite beer, 1997-1999 Campagnolo Record titanium derailleur, and Litespeed head badge jerseys. I also think I need Rush Fly by Night and 2112 jerseys.
For unpleasantly warm situations I recommend something that's mostly white to reflect sunlight.
(Shiny silver would be cooler if that was possible on a breathable jersey fabric)