There were quite a few more than 200...
but after the non-qualifying outfits are removed.. the number drops..

I was there in my accurate spandex and all.. amidst the chaos..

Then I saw this article..

http://www.supermanhomepage.com/news.php?readmore=8445

"180 men, women and children gathered at Charterhouse Square in the City to break the World Record kitted out in Superman's renowned outfit."

Since rebar is listed.. something to cover the ends is always a nice thing..
duct tape being simplest (and multiuse).. (or tennis balls, or bacon)