The aim of the work was to improve the development of a basic pattern block with modelling a curve of the side seam over the hip of the skirt or trousers. The area between the waist and the maximum hip line is completely overlooked as none of the pattern construction systems give precise instructions. To support the idea, data from anthropometric measurements of 162 young Slovenian women between the ages of 18 and 27 were used. The shape of the curve at the side seam of the skirt was quantified using a hip curve distance (HCD) based on a new measurement: an additional girth measurement 11 cm below the waist girth. The HCD range of 4,77 cm indicated significant differences in the shape of the curve at the side seam of the skirt that could not be neglected.