Short answer
Choose cloth for the places and seasons where you expect to wear these wedding suits. Ask the tailor about fibre, weight, weave and care for the specific options; a city's name alone does not determine the right cloth.
Wedding cloth is chosen against the venue’s light — midnight blue reads blacker than black in photographs, lighter greys suit daylight ceremonies, silk blends carry evening receptions.
April to June and September to October take open weaves and lighter wools; July and August are discussed honestly.
The full cloth books span fresh open weaves through four-season high-twist to winter flannels and cashmere blends. Bring the tailor your calendar; the shortlist comes back two or three cloths wide.
The itinerary is a proposal: months are planned, dates and venues confirmed individually. Final quotations are confirmed in writing before you commit.