Arguably, the idea of skin-tight superhero outfits has always been about making the art easily duplicable by a revolving door of artists. Because it’s relatively simplistic male/female figure drawing with a painted-on costume, you can have someone less expensive than Jack Kirby and jigga John Romita Sr. take over when the originating artist wants to move onto something else but the editors feel like they’ve got a profitable property and want to keep it going. You can see this shift over time, though — look at the original design for the original Lee/Kirby X-men (http://www.coverbrowser.com/image/uncanny-x-men/1-3.jpg) and then look at the design for Claremont/Cockrum class (http://upload.wikimedia.org/wikipedia/en/4/42/Giantsize1.jpg) and you go from skin-tight uniforms to more geometric shapes: triangles on Nightcrawler and Colossus, ovals for Storm. Predominately it’s still figure-drawing but there’s at least a degree of additional complexity.