I was always partial to Ororo's black thigh-high boots outfit with the lockpick "crown" in her hair...
This particular outfit looked metallic silver to me, so I'd probably use silver lycra for it.
They have instructions on how to draft your own catsuit pattern, and links with info on various commercial patterns.
Alternately, you could probably purchase a silver catsuit from a dance supply company.
For the boots, you can either buy thigh-highs ($$ and won't look quite the same) or you can follow one of the many boot cover tutorials out there.
Sarcasm-hime has one here: http://sarcasm-hime.net/bootcovers-tutorial.html
Lynleigh has one here: http://www.lynleigh.com/cosplay
To get the boot covers to stay up, I would sew them right onto the thighs of the catsuit (which, as a result, will only really need to come down to your knees or so like a pair of shorts). I did that to keep a pair of thigh high stockings up and it worked really well - took out the elastic at the top and zig-zagged them onto a pair of flesh-toned shaper shorts.
Hope this helps. I love Storm!