What Steve said....
Plus... any good sailmaker will only use paper records or on-line data for estimates.
Nothing will take the place of a set of up-to-date measurements of Your Boat.
Here is a link to a sail measurement form on-line in PDF.
I am sure that most sailmakers have available a similar form. Note how important the info on tack and outhaul allowances is, too. http://www.ukhalsey.com/download/pdf/MeasForm2008.pdf