The London Lounge

I'm a bit curious about this. What separates Sicily from "the rest"? I've tried to find some info by searching the lounge, as well as googling.
In two diffrent posts of Alden's I found this:

...the straight lapels and low slug pockets typical of Sicilian manufacture.

and

The Sicilian coat is very natural and feels like a sweater as opposed
to a coat, even when made with 650 gms cheviot tweed; the finish is also
sans pareil.

Also, I found a few pictures of a jacket made by a Sicilian tailor which had the typical Neapolitan shoulder. Is this also a something typical of a Sicilian jacket? Is it typical of most tailoring in southern Italy, or just a preference of this tailor?

I'm very curious about the Sicilian style, since I know hardly anything about it.
Comparisons and explanations much appreciated.