Give each category its own fields: Make, Model, Year, Mileage and Transmission for vehicles, Brand, Movement and Box & papers for watches, Size for fashion. Fields can be text, numbers or lists of choices, required or optional.
Niche marketplaces win by speaking the language of their buyers. With category fields you build the exact filters your niche needs, in minutes, from the admin panel.
The fields appear in the right place automatically: the sell form, the item details, the search filters and the CSV import.
Better data means better search results, better Google rankings and buyers who find what they want.