That's exactly my point.
The Dutch units at Waterloo wore the Model 1814 uniform, which they got in 1814.
In january 1815 new regulations were issued, hence 'Model 1815'. Only the Belgians, jagers excepted, got the model 1815 because they had never received the model 1814.
The cent jour site gives them all Model 1815, and that's simply not what the men wore.
Then there's also the business of the Belgian shakos which were not worn by the Jagers, but you get my point.