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.
Old Clothes New Design ---- super idea for adding new clothes for your daughters. Buy something much bigger at a thrift store or garage sale. Save scraps for other projects or repurposing other pieces of clothing.