The Wedding March - 1950 - Bridal Drama

I am looking at these trains...they are amazing. But I wonder why they stayed in fashion for weddings long after they were worn "everyday"? I am guessing it was to distinguish these dresses from any others...this was not going to show up at the grocery store. But there are several fashion historians out there, some of whom might even read this blog. So what are some of the reasons wedding dresses look they way they do?