Half the fandom hated her, but M'gann was always my favorite of the team. I adore her personality, how she always puts her friends first and does whatever she can to help them. I also love her quirks, like her catchphrase and the fact that she learned everything she knows about Earth from a sitcom. And she bakes!
This was my first time making a superhero cosplay. Everything was made from scratch, except for the gloves. I used a dancewear knit for the blue, and then a regular spandex/cotton knit for the red and white. My cape was made out of a high-quality satin - usually I don't like shiny fabrics, but I feel they work for Miss Martian, given that she's an alien and whatnot.
Before anyone asks, here is a tutorial I made on the body paint: http://www.youtube.com/watch?v=NySBYj9kE34 I use Kryolan Aquacolor for my face, PAX for my arms, and I dyed a pair of tights for my legs.
Additional FAQ: http://mangosirene.tumblr.com/missmartian