Photo from chessbase.com
It seems that the participant of this Candidate event have their own taste in term of their appearance during play. For example in his 4th game against Bareev, Leko wear a full suite with tie where as Kamsky settle with a cap and round neck t-shirt in his 4th round against Gelfand!
Some may argue that they were ask by the organiser to wear the t-shirt but what about the cap?
In my opinion, FIDE should imposed a standard dressing code especially in serious and important tournament such as the Candidate. Sponsors may have their negative perception by looking improper attire by the professional players .
There is a questions asked to Gata Kamsky about the cap he wear during his match against Boris Gelfand . Read it http://globalchess.eu/main.php?id=71