Yep, Ma said "Married in black, wish yourself back"
My paternal Grandmother used to quote this rhyme. She herself was married in black in 1906, as it was her best dress. She wore it 5 years later when she and my grandfather and my father and uncle were photographed as a family group.
My maternal Grandmother wore a grey dress when she got married in 1890.
Those who were not so well off would wear their best dresses to marry. White was not really a servicable colour for the working classes, so you had a dress from which you could get some use.
There is a black wedding dress in a costume museum in England which was made for a bride who was on the point of marrying an Army officer who was being posted to India in Victorian times. Her father died, and rather than postpone the wedding, because it would have been a long time before the groom would have been able to get back to England, the nuptials went ahead with the bride in black.