A leopard can't change its spots
aʊnke la mona se βista ðe seða mona se keða
In Spanish Aunque la mona se vista de seda, mona se queda.
This is a common Spanish idiom, similar in meaning, that translates to 'Even if the monkey dresses in silk, it remains a monkey.'
Example
"Él intentó ser un hombre de negocios, pero aunque la mona se vista de seda, mona se queda."
