Pink bra if you can see straps at shoulders? Pin on coloured fabric flower? Flower shops sell really strong magnets that you could use to put it on the dress if it's likely to hole with a pin. Habidashery shop, buy a ribbon to match fabric flower and tie round your waist with a side bow hanging down. Coloured bracelets, chunky plastic, fabric hair flowers, bright necklace, coloured shoes, hell why not if black shoes, more magnets and fabric flower bows- may go and buy some myself. You could go mad and buy some matching washout spray and write always the bridesmaid never the bride on the back and you may have a really interesting night out! Have fun