Nipple covers are the best option for hiding nipples in a backless top.
Nipple covers, also known as pasties, are adhesive patches that cover your nipple for modesty. Most nipple covers are either made out of an adhesive fabric or a flexible, silicone material that adheres to the skin.
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CrossOver Bra Wireless Bra
Honeylove's criss-cross mesh adds a signature touch, and a bonded underbust lifts without underwire. A wide wing with back-smoothing fabric eliminates back bulges. Adjustable straps and back let you modify your fit, and the straps can also be crisscrossed to stay hidden under racerback tank tops.
3D printed velvet adds support, and a bonded underbust lifts without underwire. Adjustable straps and back closure let you modify your fit. Straps can also be crisscrossed to stay hidden under racerback tank tops.