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Where the alpha's white, you'll get your texture showing up fully. Where the alpha's black, you'll get no texture - either skin, or nothing, depending on how the mesh is set up. Shades of grey give translucency. You can't change the overall shape of the mesh with the alpha - just the way the textures are applied to it. You can make the -appearance- of a shape change by shortening/lengthening sleeves on a skintight mesh, or if you have an "alpha skirt" type mesh you can change it from a short to long skirt by changing the alpha, but the shape is always the same.
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“Dude, suckin’ at something is the first step to being sorta good at something.”
Panquecas, panquecas e mais panquecas.