i cant really help you with the wig (never used one) but for the vest maybe you could find an inexpensive one at a thrift store (just any vest) and take it apart to use as a pattern. That way you can make one.
His earring is probably the easiest to make. Pretty much just a 4 sided die connected to a small chain. Im not sure about his necklace because im having difficulty seeing it in pictures but it looks like a silver cross attached to a blue heart pendent? Maybe search around stores for a cross and heart pendent then find a way to glue em together.
I hope that helps a little bit. I wish you luck with the wig