I thought this was going to be something about The One Show when I clicked on it!
I don't really get the one shoulder look either. It is unbalanced and the shoulder often looks bare in a negative way, like something unprotected. I also think it looks a bit indecisive, as if you couldn't decide whether to have the shoulders covered or not. But I dislike more the raggedy arm hankies, particularly when they get caught awkwardly on the dancer or her partner, which happens quite often when people spin around.
I didn't know I had an opinion on this until I read everyone else's! And I'm sure your dress will be gorgeous, Vivacious Lady.