Is this Flower girl dress inappropriate? Poll

I would like some opinions on this flower girl dress we picked out for my Niece. We are paying for the dress, it's just my sister (the mother) thinks the dress is inappropriate and has said no to the dress. Interested in your thoughts. I have set up a Google form poll which has an image of the dress here: https://docs.google.com/forms/d/e/1FAIpQLSeQIN1l6y9OEEV21cpgUyb9OM7RqAzwt0FkpY19PmCwI_0JsA/viewform

Thank you