This movie shows you how to using Maya's sculpting tools to create clothing wrinkles and creases that you can then output to a normal map for use on a lower resolution model.

Maya Learning Channel

Sculpting clothing wrinkles - Part 1: Wrinkles and creases

The official learning channel for Autodesk® Maya® software, the 3D animation software offers a comprehensive creative feature set for 3D computer animation, modeling, simulation, rendering, and compositing on a highly extensible production platform. The Autodesk® Maya® Learning Channel provides tutorials of all levels to help you learn Autodesk® Maya®.

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Maya Learning Channel