Long dresses are still in fashion. Difficult to give an opinion on your dress, without an image. VERY important - does it still fit you? Try it on, with your suggested accessories, and look in the mirror. (Sorry if this seems obvious, but no use leaving it to the last minute). Check online or in the newspapers/magazines to see if there is anything too old-fashioned about the dress. If all seems well with the outfit, consider which of your glittery accessories to wear, probably not all of them. Make sure you have a flattering hairstyle and makeup to complete your look. I hope you enjoy the event.