mutton dressed as lamb
US /ˈmʌt.ən drɛst æz læm/
UK /ˈmʌt.ən drɛst æz læm/

1.
oveja vestida de cordero, mujer mayor que se viste de joven
an older woman who tries to look younger by dressing in clothes designed for younger people
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Her outfit was a classic case of mutton dressed as lamb.
Su atuendo era un caso clásico de oveja vestida de cordero.
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She's a lovely woman, but sometimes she looks like mutton dressed as lamb.
Es una mujer encantadora, pero a veces parece oveja vestida de cordero.