I'm managing to confuse myself in circles
Specifically early French line horse artillery. Post republican era so I presume in shakos as only Gaurd had busbys ?
Can't work out from the plethora of sources whether they should have tall plumes rather than the shorter later version, and should they have hussar style jackets ?
The excellent 'Officers & Soldiers' series shows that the Mirliton was used prior to 1801, at which point it was replaced by the Shako.
Hope that helps. Phil