I forgot a picture here, but simply attach your ties to the open end of the blanket, tucking them inside like a sandwich, leaving the raw edges flush with the raw edge of the blanket.
Like this: one layer PUL fabric, both ties tucked inwards, then other layer of cotton fabric. Stitch across the ties only, then flip the blanket right side out.
Now tuck in the raw edges of the opening and top stitch it closed. Top stitch around all four sides for a professional look.