We're not just talking about a dress code here, we are talking about promptness and
a personal desire to satisfy your audience.
If you a professional musicians you should know once you step on stage it is show time. If you are unprepare by doing testing 1, 2,3 infront of your audience you should be embarrased.
you wasted their time and money for every minute you don't perform.
Why don't you ask wyclef Jean if there is any tolerence for that kind of behavior in the real world of music.
I am sure he would tell you otherwise.