This ensured that, if any evil kidnappers - or evil spirits, who were thought to sometimes haunt happy events according to Mental Floss - tried to take the bride away, they wouldn't be able to pick the bride out of the crowd.
The bridesmaids essentially acted as decoys against the cunning plan.
Over the Victorian era, wedding organizers became less concerned with threatening kidnappers and malicious spirits, so brides began wearing their own outfit, often more elaborate than the bridesmaids'.
The rest of the bridal party, though, didn't benefit from the modernization, and to this day bridesmaids are often expected to wear identical gowns.
For many friends and relatives of the bride, the tradition comes at a hefty price. Being a bridesmaid costs more than $1,300 on average, according to a recent study by Weddington Way.
The sum includes an average cost of $165 for the dress - but the complete price of the bridesmaid's attire, including makeup, hair, shoes and accessories, comes in at $381.