I had a blast wearing Mystique at Dragon Con 2010, its only the second time I've gotten to wear the costume T_T, but it does take me over an hour to do my makeup so its not necessarily easy to 'throw on'
Mystique Costume Info:
Mystique is made out of white matte spandex and blue tights, so I could avoid having to paint my arms and legs. My skull belt is resin casted and then painted a metallic gold. I also cut and style my wig.