Er... hello!
No, this uniform is not appropriate for 1814. Whatsoever - the basic figures allow easy modification.
If you use these chaps for wargaming only, I bet nobody would recognize the difference anyway (or even care) but if you want to have it as close to the real McCoy as possible, there's little you have to do.
Oh - and stop looking for flags. These chaps didn't carry any flags into battle.
At first: the HaT set contains early chasseurs a cheval. The coat is identical to the one of the light horse, but the latter wear high boots without tassels. Just cut' em off and straighten the boots' top line a bit. The difference regarding the size/height of the helmets' caterpillar will not be recognized at all - for this, the modelling of the HaT figures is simI ply too lousy. But you shall add a plume to the helmet.
And please - overpaint that yellow stripe on the caterpillar - that's wrong.
The late light horse wore that yellow waistbelt - perfect to hide the lower part of the uniforms' breast so that nobody would see the differense anymore. Add a small belt, perhaps by modelling one from toilet paper and wood glue.
Last thing: the saddlecloth. Light horse had a more rectangular one instead of that pointy shape - you can cut it into the right shape with a scalpel. Finally, add some pistol pockets. Done.
I wrote a tutorial about this exact subject. If you like, have a look here:
http://bennosfiguresforum.com/viewtopic.php?f=15&t=9379