Here is Princess Cadance's wedding dress at the end of season 2 episode 26. I couldn't come up with anything for the lower torso area so I decided to put in her cutie mark as an adornment for the dress. I think it complements the gown very much.
Beautiful gown I think it really reflects Cadance's gentle and loving nature, as well as her more modest and simple tastes compared to Queen Chrysalis (like how she prefers "Princess Cadance" over "Princess Mi Amore Cadenza")