Not just the climate/weather, I mean the styles of the locals.
I lived in a really outdoorsy place for a decade, never thought about it much but tended to wear outdoorsy stuff, most of the shops sold it, and to some extent, most others had some semblance of similarity.
Then I moved to an urban area, no weather related stuff at all, most people hardly bothered to wear raincoats or weatherproofs in winter, and sportswear /leisure was the most common style such as basic leggings, jeans and tee, guys in footy garb, etc.
When I visit friends in my closest city it is quite different there too, obviously, but tons of dresses everywhere! Lots more colour and variation.
I also think we now have much longer summer months than we used to, and less rain. This will also affect how we dress too. As a nation we are usually so tied up with 'bad' weather and buying the perfect coat, etc, but maybe this will change from now on. Last summer seemed to last from march to november here!
So we like to think we are original to some extent with what we like to wear, but I strongly suspect where we live has a bigger influence than we are aware of.