Hi poli
If you look in the RAE
RAE
Quote:
percal. (Del fr. percale, y este del persa pargāle, trapo).
1. m. Tela de algodón blanca o pintada más o menos fina, de escaso precio.
2. m. Taurom. capote de brega.
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in the first you can see the percal is a cheap cloth.
So one who knows "the cheap cloth" (uno que conoce el percal) is someone able to discern wich cloth is valuable or cheap. It's a person who knows the market/affair/people so you can not fool him easily:
So RAE
Quote:
conocer alguien el ~.
1. loc. verb. coloq. Estar bien enterado de un asunto o conocer bien a alguien.
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I don't know if you have a sentence similar to....
-a person who can smell rotten fish
-a person who can see thetrue value of a jewel
and so on...
saludos
