This 36-page PDF provides the tools to recognize poor fit, correct fit on a mock-up, and transfer the corrections to pattern pieces. The illustrations provided are for the fit of a standard bodice/sleeve/skirt sloper, but the techniques are applicable to most fitted garments.
Each alteration has its own page with the same or similar layout. Use the information at the top of each page to determine whether the alteration is necessary. For most people, the best fit will be achieved by many small adjustments, rather than one or two large ones.
Some fit issues discussed are specific to bodies with a developed bust, but most alterations are applicable for all persons, regardless of age or gender.