In "The Full Cupboard of Life," Alexander McCall Smith reflects on the similarities between boys and men, suggesting that fundamentally, they are the same individuals despite their differing appearances, signified by their choice of clothing. This comparison highlights the idea that the essence of a person transcends their outward presentation. Boys and men are portrayed as sharing core traits and characteristics, with clothing merely serving as a superficial distinction.

The metaphor of trousers symbolizes the societal roles and expectations placed on them at different ages. While boys wear short trousers and men wear long ones, this difference in attire does not alter their inherent nature. McCall Smith's insight encourages readers to look beyond superficial differences and recognize the continuity of identity from childhood into adulthood.