I suggested that she might not want to go with matching bunting, but perhaps opposite colours? My sister and I used to enjoy dressing similar, but my mum would always choose different colours for us. So I picked two fabrics and alternated them for the two names.
I picked out the green colour from the tiny spot in the fabric and used this colour thread for the blanket stitches embroidery round the letters. I love a visible stitch, but it does force you to be extra neat with your sewing!
I put one row of running stitch on the machine through the middle of the ribbon to hold everything in place and then I sealed the edge of the ribbon with a visible zig zag stitch, which I think adds a nice little detail.