I realize your dilemma...but did you say anything? to the staff at the door? on your comment card?
ITs true, many do not adhere to the 'suggested ' codes, but ARE expected.
Its easy for someone to try and slip in. Its your duty as a cruiser to INFORM the staff of any violations there may be. They are watching 2000 people and its VERY possible someone can slip in.
It doesn't seem really important but it is. Your help. your comments WILL alert the line to any adjustments they have to make. If you don't do your unsworn duty...I may show up at formal night wearing a black thong and bow tie. Do you really want to sit and eat looking at the hair on my chest, neck, and back? I truly wouldn't do it, but this pushing the dress codes topic IS readying for the battle.