I don't know about the cowboy boots but I assume it has similar origins to the Narcocorridos (that music video about Heisenberg in S2 as an example). Basically, in the 1980s-1990s Mexicans in LA wanting to create something uniquely Mexican to get away from basically listening/acting like black people, started retooling the traditional cowboy music/culture of Sinaloa/Chihuahua and other northern Mexican states to be more modern. Shit subsequently moved southward and spread amongst the people still in Mexico, in the 1990s-2000s. I suspect the cowboy boots have similar origins.
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