One thing that previous practice doesn't always make perfect: Marriage.
To switch lads and lassies from quickie ceremonies back to the catered works in to-be-worm-only-once white dresses, the [wedding] garment producers have turned to sociology. Through statistics as carefully laid out as a bridal train, they are establishing a correlation showing a higher divorce rate for the informally gowned.... They may just have something there.... If a bride has sunk a bunk of savings into a dress she can't use again in a second wedding, she might think twice about having a second.
Any marriage that survives a big wedding can probably survive.