Update: Apparently I AM WRONG (There goes the credibility of my blog!). Here is a message sent to me by one of our readers:
For the sake of your readers, I would like to point out that it is not entirely correct to say that Twenty20 has to be played with coloured clothing and a white ball. Even for International T20 matches, ICC's standard playing conditions state that coloured clothing and use of a white ball (with black sight screen) is only mandatory when atleast one match in the series is played under lights. I assume none of the matches at this event were played under lights.
Wearing ECB gear is another matter.