If you saw similar questions I am surprised you didn't read the answers :p
There is no simple way. The clothes when in use with a sim are part of the model btw. Either you use Ninja ripper to rip all the content displayed on your screen at the time "T" when you activate the ripping function and then go through the hassle of reassembling everything in blender. (the result of the ripping is apparently quite messy, and the model is not rigged) Or, you can clone all the part on your sim in S4S in order to export it as a blender file, and once you extracted all the piece you want, you can append them all together in blender so that you recreate your sims. This might be problematic maybe for stuff like make up I think but it should work to some level. It is mainly a matter of texture layering.
As you can see, there is no easy or simple way here. But some people managed to do it (well, mainly max20 to be honest XD). You can check his thread (forgot this one as well, probably more info on HOW)
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