Wondergirl's necklace is unique to the figure and there are no factory made reproductions available. Often, you will see a pink version of this necklace that looks very similar. It is not a Wondergirl variation, it belongs to the 12" Star Trek Ilia figure.
Titan boots are made of a softer material than most other WGSH. They are soft and flexible. There are no factory made reproductions of these boots available and they are unique to the character.