Record each area separately.
Name the salon, cabin or cockpit and explain how it is used. Photograph the complete seating arrangement and the individual pieces. Keep measurements approximate if you are unsure; final sizing needs confirmation.
Show the less visible details.
Fastenings, undersides and existing seams help explain how pieces fit. Describe trapped moisture, worn areas or uncomfortable padding without assuming that a new cover alone will resolve the underlying issue.
Agree on the logistics.
Discuss the vessel location and removable pieces before planning delivery. An upholstery enquiry is not a full refit or a confirmed marina visit. Keep those arrangements explicit.
