/cgl/ - Cosplay & EGL

For Halloween, I want to go as a female Green Lantern. Some of the women ones look like this or are a rip-off of the movie's version (which looks bad in my opinion).

However,I kind of want a more body-suit looking outfit, like so: http://farm4.static.flickr.com/3055/2719119232_9f1545e53d.jpg

I'm not exactly sure what to use since I've never really dabbled with this. I don't want a slutty-Green Lantern costume. I would like one I could wear to future cons. Also, I want a mask for the costume, but I was thinking about making my own. What materials could be used to create that? I was thinking a kind of molding... Or if you have any advice/experience with making those kind of things I would appreciate it.