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Most of it is having excellent source pictures to begin with. Pics that are small, low-quality, too dark or too bright, or have the clothing laying flat/too wrinkled will result in crappy photoskinning no matter what you do. From there, it's a matter of making sure that all the details end up in the right places - you need to use the uv map for the mesh you're recolouring to make sure all the buttons, pockets, zippers, seams, etc., end up in the right places. I have a tutorial on exporting the uv map for your clothing mesh - look under my profile, or in the BS Skinning tutorial section here.
Make sure you cut out piece by piece - the biggest mistake I think people make photoskinning is just copying the whole thing at once - do it in little sections detail by detail and get each detail in place and then blend the edges. If you can do a selection with feathered edges in GIMP, that helps a lot when copy-pasting each piece.
You may also have to do some hand-painting and adjusting overtop of the photoskinning - very rarely can you just copy-paste and be done. You may have to do a lot of fiddling with it, adjusting shadows and highlights and that sort of thing, until it looks right.
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Panquecas, panquecas e mais panquecas.