I’ve seen a post from a Lorreta that claims she had an on an off relationship with Townes in the Early seventies…she said that she tended bar while in college when she met him…
I believe that the phrase “wears them sevens on her sleeve” is a poetic way to say she served liquor… as in Seagram’s Seven..
She would hand them out as if they were on her sleeve…
Probably my dead interpretation of an obscure phrase..