I shoot IPSC more than IDPA, so I already have the double belt.
Was this "street" look an older rule book thing? Or is this "requirement" just one of those legend things, where a misunderstanding from years ago just keeps popping up. I've seen this "street" look requirement elsewhere on the 'net too.
ged since then
I have my second ever IDPA match on Sunday. Haven't decided which belt to use.

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The rule hasn't changed since the 2005 RB was published and remains almost unchanged. The rule is easy to follow, and is quite clear. The missing two belt loops facilitates the use of holsters and mag holders. You cannot use a double belt like that used in IPSC in IDPA. You can use the inner belt lopping through all but two of the pant belt loops.
Take Care
Bob