Is this dress appropriate to the wear to the beach

I wear this dress all the time out, going places and it’s summer here and we’re going on holiday to the sea. My utterly controlling bossy sister says I can’t wear it to the beach, it’s not appropriate, wants me to go shop and get new dresses to wear there and says if I don’t I can’t come. Is this insane. The whole holidays I’ve been with her all she does is boss me around and tell me what to do 24/7. Im exhausted, depleted I don’t know what to do,


A woman literally wearing it at the beach.