Jacket of cadet of Saint Cyr (officers school), with black armband (WWI ?)

Includes a jacket, moth-eaten and unstitched at the collar (see photos), oxydized buttons to clean if you wish to do so yourself.
On the left arm, a mourning armband, not specific to the Great War, since it was already authorized by regulations in the late 19th century, to be worn on the left arm in cases of family mourning.
There was, of course, mourning among the military even before the Great War, but few French families were untouched by the death of a loved one in combat, starting in 1914. It was likely during this period that the wearer of this uniform added this mark of mourning to their uniform.
Waist measurement: 74 cm.
Chest measurement: 88 cm. (for a very slim person!)
Interesting for the collection.