I'm going to a wedding (in Malaysia, hehe) where there is this no black rule:
"You should wear anything but black for the church service in the morning. Unless you’re a guy wearing a black or dark suit, which is fine. Try to avoid black dresses for the morning ok?"
On reflection, if men can wear black suits, they can wear black pants.
Attending a wedding for the first time, a little girl whispered to her mother, "Why is the bride dressed in white?" "Because white is the colour of happiness and today is the happiest day of her life," her mother tried to explain, keeping it simple.
The child thought about this for a moment, then said, "So, why's the groom wearing black?"