Victorian Mourning
Long before Queen Victoria came to the throne all European countries and elsewhere had their own mourning traditions, however one event changed things at least in Great Britain,and much of the United States where at least the upper classes tended to follow customs,fashions and mores of the "UK": Prince Albert, Queen Victoria's consort died. That event sent the young widow into pretty much a permanent state of mouring the rest of her long life.
What followed through the Victorian and much of the Edwardian period was in some cases an almost morbid custom of mourning and or fascination with death.
Besides the strict rules about who could wear what and when, which fell mainly to the wealthy and new middle class ladies who had time for shutting themselves up and money to spend on clothing, there was all sorts of things such as broches and bracelets made from a lock of hair from the deceased.
Photography had just come on the scene during the Victorian age and the rage was for persons to have pictures taken of the deceased (sometimes with the whole family) as a momento and or to send copies to those whom could not attend the funeral. There is a *HIGHLY* collectable book of "post mortem" pictures called "Sleeping Beauties" made from a collection of such photographs.
It was during the Victorian era we started to get those grand and to some gaudy horse drawn hearses along with the masses of heavy drapery and what not that would be brought in to turn whatever room was being used in the family home to hold the wake.
Allot of this started to die down after WWII,especially in Europe. So many persons had died that governments and society wanted to "move on" and not give comfort to the enemy nor dwell on the past by exaggerated displays of grief.
Gone With The Wind was set during this period and you see Scarlett at first revolting at having to wear full widow's mourning of the period (I'll just go around scaring people in *THAT* thing),she quips tossing her veil aside in favour of a pretty hat. Later after her second husband's (Mr. Kennedy) funeral we see the remaining decorations still in the front parlor when Rhett Butler calls.
http://morningpassages.com/2010/04/post-mortem-photography/