Often style will come from idiosyncrasies, which you repeat over and over again, and less so from copying general rules carefully. Lino Leluzzi in his super tight double breasted jackets, extreme cutaway collars, wool tie, and heavily decorated and patinated monk strap shoes is a prime example.
Another fellow, which has a trademark attire, is the fellow above. I don’t know his name but he is visiting Pitti Uomo too. He likes jeans and double breasted coats, he has a fine moustache and brushed back hair, however what I notice the most perhaps is his unbuttoned shirt cuffs. They are always dangling on his hands. In a way the omission is ridiculous, yet it is defining feature. If you button those cuffs, you are weakining his style.
Photo: The Journal of Style