"There is an infinite difference between the nude and the naked, between the natural and the undressed. In the presence of the pure, unconscious nude, nothing can be more contemptible than those forms in which are the hints and suggestions of drapery, the pretence of exposure, and the failure to conceal. The undressed is vulgar -- the nude is pure.
The old Greek statues, frankly, proudly nude, whose free and perfect limbs have never known the sacrilege of clothes, were and are as free from taint, as pure, as stainless, as the image of the morning star trembling in a drop of perfumed dew."
And...
"The great lady, in velvet and jewels, makes but a poor picture. There is not freedom enough in her life. She is constrained. She is too far away from the simplicity of happiness. In her thought there is too much of the mathematical. In all art you will find a touch of chaos, of liberty; and there is in all artists a little of the vagabond -- that is to say, genius.
The nude in art has rendered holy the beauty of woman. Every Greek statue pleads for mothers and sisters. From these marbles come strains of music. They have filled the heart of man with tenderness and worship. They have kindled reverence, admiration and love. The Venus de Milo, that even mutilation cannot mar, tends only to the elevation of our race. It is a miracle of majesty and beauty, the supreme idea of the supreme woman. It is a melody in marble. All the lines meet in a kind of voluptuous and glad content. The pose is rest itself. The eyes are filled with thoughts of love. The breast seems dreaming of a child."
From Robert G. Ingersoll's Art and Morality.