A bit overdressed...
Now don't get me wrong here, I love this film, and admire it's superb accuracy, but of course it is a movie, and some things, perhaps deliberately, are wrong.
Much is made of the battle being fought by "dazzling dressed" troops. This was not the case in real life. The uniforms depicted in the film are very accurate reconstructions of the full dress uniforms of the period, but on campaign and in battle things were different.
The French army invariably marched and fought in long drab colored overcoats and loose trousers, their headgear protected with cloth covers, their tassels and plumes safely tucked away in their knapsacks. The British, though resplendent in their redcoats, similarly covered their shakos and other headgear to protect the adornments from damage.
An exception was usually the French Imperial Guard, especially the grumblers of the Old Guard Grenadiers.On the march their bearskin hats were stowed away in cloth bags strapped to their knapsacks,replaced by black felt bicorne hats, they wore dark blue overcoats and trousers, rather than the full dress white breeches and high black gaiters. But when committed to battle, usually as a decisive blow at the end of the fray, they would be wearing their dress kits, carefully brushed up and put on before the attack.
But not at Waterloo. They weren't given time to prepare, and launched their attack still dressed in their marching garb. The men of the Guard took this as a bad omen, and they were perhaps right about that, considering how things turned out.
But the film makers decided to go for the more impressive dress, and maybe they were right. It does look spectacular, and makes it easier for the viewer to distinguish the different units.
War is never a pretty thing, even in the age of Napoleon.
"Savage stuff, Ponsonby!"