I propose a Smell Die: The Smell Die starts as a d20. Every day a character goes without bathing (with soap!), their Smell Die decreases in size by one (minimum d4). The result of the Smell Die is the DC of the Perception check (or whatever) needed for a monster or NPC to smell the character.
This is kind of unintuitive as the Smell Die *decreases* as the character's body odor *increases*. Maybe the base DC to smell a character is 20, the Smell Die goes from d4 to d20, & the number rolled is subtracted from the DC?
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