You must be absolutely sure of what you want, so that dressmaker can give you an accurate quote – which means you have to try on as many dresses as possible – make a note of:
Material – eg - silk satin, chiffon, organza, duchesse satin

The shape – eg empire line or strapless etc, etc
How many layers of fabric? – is there an underskirt?
Details such as embroidary, type of train or whether it requires a bodice? Bodice work will push up the price – but all ready-to-wear wedding dresses that have bodices are …