Abour eight years ago on Voyager my mom came into Compass Rose in jeans. For those that knew me back then, you can imagine my reaction. Still, she is my mom so I never said anything; neither did anyone else. I also remember a trip about the same time where an older gentlemen (not that much older but definitely a gentleman) walked into Compass Rose on an informal night without a jacket. He was kindly reminded of the dress code, and did a u-turn to go get a coat. He was mildly embarassed; seemed more apologetic, when he walked back into the dining room.
On PiP, there was someone that always wore shorts to the casino at night even though the policy was no shorts after 6pm. All of these are minor transgressions. I can tolerate nice jeans in dining room but I will definitely put a negative comment on my comment card if someone wears shorts into Compass Rose.