Hi Mike. To the best of my knowledge - the Egyptian Cavalry didn't wear Blue coats with Khaki pants. The figures shown (so far) have been the Egyptian Camel Corps (ECC) - on both camels AND horses. The ECC weren't classed as Cavalry. I haven't started painting or collecting any of the EEC - as I don't really see what all of the fuss about Camels is all about - and I therfeore, don't know a lot about them or their uniforms. I have read quite a bit about the Egyptian Cavalry Regiments though - as a precursor to painting up a set of The Khedive's mounted Military Band.
This band wore a red Tarboosh (Fez) with black tassel - Lancer style tunics and trousers in a light blue - with a buff/white plastron - double white stripe down each trouser leg - and dark blue putees with black boots. I have a few pictures and illustrations showing this - as I like to research as much info as possible - before starting a project.
In my various online readings, however, I came across an article that stated that, "The further one gets away from Cairo - the more mixed the dress of the troops appear". Officers often wore their Blue Dress uniforms all of the time ( instead of changing into the "White Summer Dress"), and the introduction of khaki was often on a piecemeal basis ( I think this started from about 1885 onwards - read it somewhere - but not certain about that).
Another thing to note - this time from personal experience - is that clothing exposed to heat dust and rain in hot climates - frequently change colour over time - as it's being worn. Line up any troop of soldiers you like - and it is rare for any to have EXACTLY the same shade of clothing on. The longer you have a piece of kit - the paler it goes - generally speaking. With the old vegetable based dyes that these Egyptian soldiers had at their disposal - that MAY be one reason that the darker blue jackets became paler under dusty, strong desert sun - over time. That may be another reason that TS manufacturers paint their figures the way that they do - just as I do - from a favoured old photograph - like this one - which is of my Cavalry Band ( though mine are mounted). Hope this helps. jb
[N.B. Many thanks go to Trooper - for this old photo of the Egyptian Cavalry Band - dismounted]