Abstract: A three-dimensional pattern design method for garments fitted with sleeves concerns a general pattern method for speedily designing garments for men, women and children without further alterations being required. The method is characterized by the use of a particular structural line (A1-G-A3) determined by the body's morphology and attitude, by specific proportional calculations of the waistline, the collar and shoulder slope using reference values (Vx, Vy), by a specific relational and three-dimensional calculation of the armhole-sleeve fitting using transfer lines (G-C, G-C1) defining a reference value (Vz), by the calculation of two tension points (P, P1) for enabling a proper fitting of the garment to the shoulder, and by a single drawing line incorporating all the garment's basic components into the assembly plan. The method according to the invention is especially suitable for use in the dressmaking industry.