It's not a "thing" any more. Most weddings I've been to lately had a few people wearing black.
Only rules are don't wear a wedding dress unless you are a bride (or that way inclined groom) - apparently this actually happens & don't show your knickers or nipples.
People just aren't superstitious around weddings any more. Most of the old traditions are based on superstitions.
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apple trees not flowering this year. Anyone else?