i dont think outfit categories like shorts or jackets would be considered warm, cold, neutral as a whole. where would you put all pants, shoes, hats...
likely it is a tag for especially light or warm clothing only, all cc considered neutral. i doubt it but it would be great if we can change the tag on clothes ingame.
my hope is that its a mix and match system anyway, so the more warm items you wear the better protected you are against cold, same for summer clothes no overheating for wearing a baseball cap.
while i like the idea of simply saving a warm and cold outfit its impractical as the npcs need categorized items to not act too weird with this freedom.