gaw: Hashem’s Army has many divisions, each with their own uniform.
Good answer! So the fix should have been:
“People want to show they are part of the “Yeshivish” division, so they wear the division colors.”
Just like there are Chassidish, Yerushalmi, Dati Leumi, Moroccan, Syrian, Yekke, YU, and plain “Yeraim” divisions of Hashem’s team, as well as many others.
Personally, I may have described it as different teams in the same company/army, each with their own uniform. Some even need to be plainclothes, or may even wear someone else’s colors, but they still work for the same cause.