Origin of White Wedding Dress

A son asked his mother the following question:

'Mom, why are wedding dresses white?' The mother looks at her son and replies:

'Son, this shows your friends and relatives that your bride is pure.'

The son thanks his Mom and goes off to double-check this with his father.

'Dad why are wedding dresses white?'

The father looks at his son in surprise and says:

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'Son, all household appliances come in white.'