Stitch lace or ruffles to spaghetti straps to widen. (Although this may be a bra, you get the idea.) Sew a ring on the underside front and back of top. Use chains or strings of beads, attach with necklace clasps for easy removal to wash top.
DIY bra top Site says to sew on elastic. I just took my convertible bra and did the halter top way to wear it AND hooked up the other strap to the back, looping it through the halter strap. It works great! Gives a nice geometric triangle
Control annoying bra straps with a hidden tab. and other DIY helps
Why Vanishing Back bras are a top seller: Innovative zones give you firm hold where you need it, and stretch in all the right places to be comfortable all day. The fabric is designed to totally smooth your back and sides – no bumps or lines to see here! Another stroke of genius – stay-put straps adjust in the front. Try Vanishing Back and see for yourself why we’ve sold 5.5 million and counting.
simple sewing DIY to help shirts that slide off your shoulders! Sew snap into inside hem of shirt and clasp it around your bra strap. Also helpful for bra straps that always seem to fall down even when tightened.