Like any spoken language, and even considering the variations in gestural languages like sign, the Attire language is one full of colloquialisms, slang expressions and regional variations. The daily apparel of an office worker in Miami varies from the office attire of a worker in New York. The street clothing of new York varies from that in San Francisco. The evening attire in San Francisco varies from that in Phoenix. And that's just the United States.
Many of these subtle variations are determined by climate. For example, while you can readily see people out doing their daily errands in not much more than their swim wear, while you're in Malibu,
The second thing that is a major player is the dominant type of employment for the people of a particular place. Is it rural or urban? If its urban, what kind of industry is predominating there? If its rural, what kind of agriculture is done? So, say we have an urban environment largely devoted to politics, like Washington DC. The clothing choices there are far more conservative overall than would be the norm for some other major city, because of the type of work being done there. Its essentially a company town, and you must be seen to be part of the company, by abiding the dress code.
The third thing that invests a place with its regional individuality is the ethnicity of the majority of the people there. Albuquerque has a very large number of people who are either Native Americans or are of Mexican heritage, and their history and culture affects the style, color and fit of a good deal of the apparel worn. In my birth place of Pittsburgh, where the vast majority of people originally hail from Eastern Europe, that has had its effect on how people dress, by a certain reliance on the colors and patterns of the old country.
The final, and perhaps the most important part of this process is what, for lack of a more precise term I'll call the vibe of a place. How the people there think about themselves and their position in the world; how they view the rest of the globe; and how they respond to the inevitable odd balls in their area all contribute to that vibe.
So, any and every place has its little subtle variants on what we wear, dependent on climate, business, ethnicity, and general social energy. Look around at your own home place, wherever that may be and try to determine what things make it sartorially unique.