Two young children, one wearing a red striped shirt, are looking in through the window while an adult in a pink shirt watches from behind.
Nobody has a shirt
Two young children are more than nobody at all.
The adult watching from behind does have a pink shirt.  Therefore, we cannot say that nobody has a shirt because at least one person is wearing one.
If nobody had a shirt then a kid cannot be wearing a shirt and watching an adult who is wearing a pink shirt