Chap. CXLVIII.—Of Folds.
The folds of draperies, whatever be the motion of the figure, ought always to shew, by the form of their outlines, the attitude of such figure; so as to leave, in the mind of the beholder, no doubt or confusion in regard to the true position of the body; and let there be no fold, which, by its shadow, breaks through any of the members; that is to say, appearing to go in deeper than the surface of the part it covers. And if you represent the figure clothed with several garments, one over the other, let it not appear as if the upper one covered only a mere skeleton; but let it express that it is also well furnished with flesh, and a thickness of folds, suitable to the number of its under garments.
The folds surrounding the members ought to diminish in thickness near the extremities of the part they surround.
The length of the folds, which are close to the members, ought to produce other folds on that side where the member is diminished by fore-shortening, and be more extended on the opposite side.