Thanks for the replies! Yes, good questions.
What I mean by Italian style in the local context I suppose is someone whose house style adopts many features of Italian tailoring, some of which you have mentioned. Could be Barchetta pockets, structure (or in this case the relative lack thereof), buttonholes, shoulder style, darting etc. I have something quite specific in mind for a Florentine-style suit so it is important that the tailor is at least familiar with the Italian suit-making tradition eg. when their house style adopts many features or is based on Italian suit tailoring concepts. Granted we're in Southeast Asia so I don't expect someone to fit the bill exactly of a central Italian tailor

But would appreciate if anybody from their personal knowledge or experience could point me to some tailors like that for me to consult!
Regarding fabric, I am not fussed as it's going to be a more casual project, looking for hopsack in a shade of green so am happy to go with basically any mill which has fabric of the texture and colour I want. Maybe VBC hopsack comes to mind.
On the type of "bespoke" tailoring I am looking for, yes the cutting of personal patterns is fundamental but how do you practically tell which they use? Would be good to learn from the wealth of experience here haha.
No. of fittings to me is not as crucial because sometimes after 1-2 fittings it can be cut very well and there is no need for further wastage. My experience so far has been that it is really obvious when it is made-to-measure, and that the "bespoke" tailors will look at your posture, gait, shoulder slope, length of arms (uneven for me) along with a host of other measurements and images to get the fit pared down, and they will conduct fittings with no definite number set, as needed, could be 1 - 3 from what I've experienced. On whether they save your personal patterns, some of the tailors I've been to have this electronic sheet of your measurements and when you visit they will just confirm very quickly that nothing much has changed in that respect, not sure if that's what you are referring to?
Appreciate the time! Will check out Dylan & Son in the meantime.