Pattern grading: making sets of patterns to fit a range of sizes, the next step in the design process. Ever since the 1950's, there have been machines that will do this for you. But, having your patterns graded professionally can cost a lot. Luckily, grading one manually is not too difficult. The website www.burdastyle.com has some great tutorials on grading all different kinds of patterns.
Burdastyle has a ton of great free patterns, as well as a sewpedia, a comprehensive tutorial section, and a place for members to showcase their creations. It's definitely a site worth checking out, and maybe spending some time there learning a few new things.
Grade a skirt and pants pattern
Grade a sleeve pattern
Grade a bodice pattern