Many centuries ago, white gown was not the colour bribes wore on a wedding day until something extraordinary happened to make white gown the tradition.
Wedding dresses are white. That’s just how things are.
Doesn’t matter if you literally never wear white in your normal, everyday life. Doesn’t matter if you know, deep in your heart, that you are embarrassingly clumsy and WILL drop something on all that pristine white satin.
Wedding dresses are white, and only ‘unconventional’ brides wear another colour.
Which is a silly social convention to uphold so strictly, really. Because wedding dresses being white is actually a fairly recent fashion choice.