The idiom highlights significant achievements or acquired skills, often through experience.

Achievement Emphasis

This phrase is metaphorical and does not refer to actually wearing something.

Not Literal

It often suggests a period of time has been spent to achieve or learn something.

The phrase conveys a sense of being well-fed or sufficiently nourished before an activity.

Implies eating as a form of preparation for a task that requires energy.

Like its counterpart, this usage is metaphorical and means consuming food, not storing it physically.