BACK TO START Python texture was the name of the game this spring as designers from Matthew Williamson, Gucci and Prada used the slithery stuff to craft gorgeous pumps, platforms and purses. If you're looking to add a touch of the exotic to your wardrobe, snake is the skin of choice for spring 2009.   WHAT: Nine West snakeskin wedges WHERE: Piperlime HOW MUCH: $89   WHAT: Jessica Simpson python clutch WHERE: eBags HOW MUCH: $68   WHAT: Oversized python purse WHERE: H&M HOW MUCH: $29.90   WHAT: Calvin Klein python pump WHERE: Piperlime HOW MUCH: $98       BACK TO START