British heptathlete Jessica Ennis poses for photographers in front of a depiction of the British Union Flag during the launch of the team kit that will be worn by British athletes at the London 2012 Olympic and Paralympic Games at the Tower of London in London, Thursday, March 22, 2012. The kit unveiled Thursday, was designed by British fashion designer Stella McCartney. (AP Photo/Matt Dunham)

British triple jumper Phillips Idowu, left, and heptathlete Jessica Ennis, right, pose for photographers in front of a depiction of the British Union Flag with designer Stella McCartney during the launch of the team kit that will be worn by British athletes at the London 2012 Olympic and Paralympic Games at the Tower of London in London, Thursday, March 22, 2012. The kit unveiled Thursday, was designed by British fashion designer Stella McCartney. (AP Photo/Matt Dunham)

British triple jumper Phillips Idowu, left, and heptathlete Jessica Ennis pose for photographers in front of a depiction of the British Union Flag during the launch of the team kit that will be worn by British athletes at the London 2012 Olympic and Paralympic Games at the Tower of London in London, Thursday, March 22, 2012. The kit unveiled Thursday, was designed by British fashion designer Stella McCartney. (AP Photo/Matt Dunham)

British triple jumper Phillips Idowu, left, and heptathlete Jessica Ennis, right, pose for photographers in front of a depiction of the British Union Flag with designer Stella McCartney during the launch of the team kit that will be worn by British athletes at the London 2012 Olympic and Paralympic Games at the Tower of London in London, Thursday, March 22, 2012. The kit unveiled Thursday, was designed by British fashion designer Stella McCartney. (AP Photo/Matt Dunham)

British heptathlete Jessica Ennis models an outfit during a show at the launch of the team kit that will be worn by British athletes at the London 2012 Olympic and Paralympic Games at the Tower of London in London, Thursday, March 22, 2012. The kit unveiled Thursday, was designed by British fashion designer Stella McCartney. (AP Photo/Matt Dunham)