Since MLB 4th of July caps and gear have been around quite some time, I will make this a two series article.
While Nelly was partying hard with “Hot in Herre” (btw recently the woman he danced around with passed away), MLB teams started to wear special 4th of July designed caps for the first time in 2002, as a reaction to the September 11 attacks the year before.
That is 20 years of history of the special event 4th of July gear. That is a long time.
Apparently, if we have to believe the Internet since I didn’t really watch baseball back then, from 2002 to 2008 the Diamondbacks wore just a flag as a patch on their baseball caps, just like all other teams.