Charol translates to "patent leather". It's a specific and somewhat old-fashioned material, making it a unique word choice in a song.
In the lyrics, it appears in the phrase "zapatos de charol" (patent leather shoes), evoking a classic, perhaps even nostalgic, image. This word stands out because it's not a common, everyday term, adding a touch of distinctiveness to the song's imagery.
This song is a sweet, direct serenade! Our singer is completely smitten and wants to tell someone how they feel, but they're a little unsure how to say it. They wonder, "y si querés no sé cómo te lo diré tal vez cantando esta canción" [and if you want, I don't know how I'll tell you, maybe by singing this song].
It seems like the person they're singing to is quite innocent, perhaps wearing "un vestido de crochet zapatos de charol" [a crochet dress, patent leather shoes]. The singer is determined to win their heart, saying, "mi voz está prometida y tan sólo será para mí en tanto tiempo me llevo desde aquí sabes ganar tu corazón" [my voice is promised and it will only be for me, in so much time it takes me from here, you know how to win your heart]. They're ready to make an invitation and take this connection to "otro lugar" [another place], all for this song and the love it expresses.