Prior to this sewing patterns were made to fit a specific individual, and were originally made on cloth, and only later on paper. A tailor or dressmaker recorded a customer's measurements on a thin strip of parchment and kept it with the pattern pieces, noting any changes in measurements and adjusting the pattern pieces accordingly. This required a good eye and many years' experience. Frequently an apprentice tailor's indenture specified that the apprentice would inherit the master's patterns upon the latter's demise, while enjoining complete confidentiality upon the former; patterns could also be passed down via family inheritance. Early tailoring books, beginning in the sixteenth century gave advice on the quantity of material needed for certain garments, and gave simple diagrams of clothes. The reader could draft patterns by using these illustrations as a guide. One of the earliest illustrated guides is "Libro de Geometrica Practica y Traca" by Juan de Alcega, published in Madrid in 1589.