Bra hacks: DIY 3 Strap Bra for Backless Tops and Dresses. All you need is: a strapless bra in your size (preferably pick one with boning in the side so it does not collapse on itself.
Love the detailing on this neckline-not that difficult to do either. Boat neck jersey top with leather insert - geometric fashion design detail; sewing ideas // annemieke via Burdastyle
Top 10 summer shirt, blouse and tunic sewing patterns - Behind the Hedgerow- The top pictured might be nice in a softer color fabric or floral, and might be a good pattern to make into a shirt dress.