Mutton Dressed Up as Lamb

What does the idiom “Mutton Dressed Up as Lamb” mean?

Definition:

A woman who dresses in a style appropriate to someone of a younger age

For example:

“Did you see Sheila in a miniskirt? At her age, she’s mutton dressed up as lamb.”

Notes:

This is rather sexist and is now rather rare, used mostly humorously.

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