Short answer
Your written quotation confirms the delivery schedule for this shirts commission, including cloth, production and destination. Milan's proposed visit window is APR · MAY · JUN · SEP · OCT; dates and venues are confirmed individually.
Your written quotation confirms the schedule and remote-order arrangements for your cloth and destination before you order.
Milan's window
The proposed APR · MAY · JUN · SEP · OCT visit is the planning point for Milan commissions. Dates, venues and available appointments are confirmed individually in writing as the month approaches.
The itinerary is a proposal: months are planned, dates and venues confirmed individually. Final quotations are confirmed in writing before you commit.