For a simple soft button you need at least:
aluminium foil (from the supermarket)
some electrical wires,
soft material like foam, foam rubber, polystyreen
cloth to cover your button
scissors or a cutter
no soldering yet!
more advanced, and more expensive:
you can replace the aluminium by conductive aluminum laminated fabric, see plugandwear.com
or by velostat
or by conductive thread,
you can replace the simple electric wire by a thinner wire, I prefer the thinnest possible in clothing
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