Why are dad's, fiancé's, grandparents all expected to buy the wedding dresss?

19magic
If I were to have a wedding I'd buy one either myself or jointly with my partner but on so many TV shows and in many films its always the family or partner that fully takes the cost of wedding into their hands including the dress. Or even I might just rent one instead no need to spent loads of money for something you're going to wear once, although I do like the idea of passing down the wedding dress to my daughter and granddaughter etc
Why are dad's, fiancé's, grandparents all expected to buy the wedding dresss?
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