A black asymmetric dress has a diagonal upper line, long sleeves and a relatively continuous close skirt in this reference. Some sleeve and lower areas appear more translucent than the main body. A red bag provides a small contrasting point. The visible surface does not show the dense repeated lines somebody might mean when asking for fine pleating, so it is useful as a quieter comparison instead.
Try a similar dress with arms relaxed and then reaching forward. The covered shoulder and opposite upper edge can respond differently during movement. Look from both sides and decide how the diagonal sits with your intended outer layer. A quiet skirt surface does not establish extra stretch, easy walking or any particular material; those questions belong to the real garment.
Compare the red-bag idea with a bag you own, first beside the dress and then in its carrying position. Decide whether you want that small contrast or prefer the whole outline to remain darker. This helps separate your interest in colour placement from your separate search for a repeated fold pattern in another option.