elegance of manners

See: courtesy
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References in classic literature ?
She had taken the polish well, acquired considerable elegance of manners, quite lost her provincial accent, and could boast of more accomplishments than the vicar's daughters.
Such elegance of manner, so many graces of deportment, such powers of conversation, could never pass unnoticed.
Blandois accepted the commission with his own free elegance of manner, and swore he would discharge it before he was an hour older.