The
casquette à pouf was only used in Egypt, and never by the mounted guides - who wore bicornes - or the
chasseurs à cheval who wore a peaked
shako-mirliton or a locally-made black shako. The foot guides were the only ones to be issued the leather
casquettes, which were discontinued when the
armée d'orient returned to France.
Line
chasseurs à cheval of the Consulate period mostly wore the 1801 shako. Prior to its introduction, mirlitons and peaked
shako-mirlitons appear to have been the dominant form of headgear among the chasseurs during the 1800 Marengo campaign. The
ancien régime Tarleton-style helmet does not seem to have been seen much after 1798, though some units no doubt continued to use their old
casques due to supply shortages.
As far as 28mm figures are concerned, I'd suggest the Brigade Games mounted guides for Marengo campaign
Chasseurs à cheval de la Garde Consulaire and the Eureka Wars of the French Revolution range for bog-standard line
chasseurs à cheval. The good thing about the Eureka range is that it gives you plenty of uniform and headgear options, including the Tarleton-style helmet if you must absolutely have it.
The H&C books on
Chasseurs à Cheval are a useful guide to the uniforms of the period, though they don't cover the
Garde Consulaire. The text is in French but they're very heavily illustrated in full colour, which makes them easy to understand.
http://livres.histoireetcollections.com/publication/2751/chasseurs-a-cheval-1779-1815-tome-1.htmlhttp://livres.histoireetcollections.com/publication/2883/chasseurs-a-cheval-tome-2-1779-1815.html