In "The Importance of Being Seven," Tofu is portrayed as a character who wears unique flame-proof pants, often referred to as fibbers' trousers. These special pants are designed to prevent igniting when someone is telling a lie, highlighting the comedic element of the story. Tofu's knowledge about these trousers suggests a playful awareness of the concept of truthfulness and its consequences.

The mention of these trousers also adds a layer of whimsy to the narrative, showcasing the witty approach of author Alexander McCall Smith. The idea that clothing can physically react to dishonesty underscores the light-hearted, fantastical tone of the book while offering commentary on honesty in a humorous way.