I went for early war uniforms albeit with the grey linen shako covers. Probably stretching it a bit, even for early 1916, but the later uniforms are very drab and a bit of colour was needed. These lads wouldn't look out of place on a Napoleonic battlefield!
There were 16 Hussar regiments at the outset of the war. However, remounts became scarce as the war progressed and a number of regiments were dismounted. I used the fine colour plate in the Osprey MAA 392 as my reference.