Concert is about 2 hours or so. You lose track of time since you're so caught up in the moment.
I went with slacks & dress shirt. Friend did a button up and slacks. Other friend first night didn't have time to change and wore denims and a Dalaran University t-shirt. So it is a mixed bag. First night at the LA concert, a guy cosplaying as Kefka was in the front row and even got caught up in the standing ovation after Dancing Mad and took a bow along with the orchestra. It was all in good fun.
XI Wiki



