This close black mini has narrow straps with small gold-toned ring-like connections near the upper front. The edge curves into a soft V, with gathered and folded areas continuing towards a diagonal overlapping lower border. Both hands lie low near the hips and thighs. A linked necklace carries several small hanging shapes, including a crescent-like element. The head is cropped above the lower face; the short hem is visible but the feet are not.
Separate the small connection from what it might do. Its visible shape does not prove that it opens, adjusts or detaches, and its colour does not identify a metal. Likewise, the close outline is not evidence of stretch, comfort or support. The photograph gives a usable reference for the spacing of the straps and the short overlapping border.
Ask for a closer view of the actual connection if it affects your choice, then request a complete outfit view for the shoes. Keep the necklace as a separate accessory decision. This mini can contribute a visible shape to a vintage-inspired plan without becoming proof of a period, maker or complete matching set.