From LightWiki

Download all the tools from Plg tools. Install them in the usual fashion.

The main tool to use is PLG UV Edit. It allows you to mark 'seams' and unfold the UVs of the mesh along those seems like a piece of clothing.

Open your object, for this example I'll be using a sphere.

Activate the tool, and make sure you have the numeric panel open as it has a lot of options. It starts off in edge mode. If you click on an edge, that will highlight that edge in blue as a seam. I find the best way to work with it is to switch to point mode, so change that in the options. In point mode, left clicking a point puts a circle on it, and makes it a start point.

Middle mouse button clicking another point on the mesh will make the plugin try to find a path from the start point to the second point, marking a seam between the two.

This works fairly well, but if it doesn't go along the path you think it ought to, press the Undo button in the numeric panel and try clicking closer to the start point. Once you've marked the seams you think you need, click the Make UV button at the bottom of the numeric panel. At this point the plugin tries to unwrap the mesh, cutting it along the seams you've marked.

If you're not happy with the unwrap, you can mark more seams to try again.

The Make Atlas from Surface marks all the Surface edges as seams. Make Atlas from UV uses any UVs already on the object, and marks the UV maps' seams. Make Atlas tries to mark seams based on poly angles, it's not terribly useful but for simple objects might be okay.

There's some more options, check out the Plg_Make_UV_Edit page for more information