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I prefer mat poses, simply because I know where to find different texture options for items, Load a hair or clothing, go to the /v4 clothes/ folder and find the folder with the clothing and load pose. For hair the pose folder can hold both mat poses and style poses. The mat folder is another place to check and would be just as crowded if everybody used it.

That only works if you go in and move them around yourself. Otherwise the MAT files get stuck where ever that particular merchant wanted to put them. If your reorganizing your Pose library you may as well be reorganizing the material library and then you'll know where everything is in the material library. Six of one 1/2 dozen of the other...

The mat library wouldn't be as crowded because there wouldn't be poses mixed in.