If youre wearing a dress with a fitted bodice and a backless or sheer back, you can opt for stick on bras or nipple covers, but I recommend using detachable cups for better support. Here are two easy How to cover your nipples in a backless dress Stylight srdmuph Sticky Bra Invisible Silicone Lift Up Self Adhesive Push Up Reusable Backless Dress Strapless Bras for A to D Cup Stick On Breast Nipple Covers (Nude, M (for A B Cups)) at 80pcs self nipple covers invisible no show Temu Sweden