Four men and three women, all in their beach attire, hang around a small cliff by the ocean as one man is about to dive into the water.
Nobody has beach attire
If the men and women are all in beach attire, then it cannot be true that nobody has beach attire.
The group is either in beach attire or nobody is in beach attire.
If all people are in their beach attire, it is wrong to claim that nobody has beach attire.