The style blog TSBMen just did a post on waistcoats today. The first and last look look good to me, but I'm not the biggest fan of the second one. The guy looks like and is a complete hipster though. The outfits would look better on someone more masculine as other posters have pointed out.
http://tsbmen.com/51840/waistcoat-layeri...santander/
http://tsbmen.com/51840/waistcoat-layeri...santander/