Does your query refer to a French cavalry regiment? In which case you would be best addressing your question to a forum that deals with French military matters although there may an interest overlap for some members here.
If you mean the 19th Hussars, the title assumed by the 1st Bengal European Cavalry in 1862 after they transferred from East India Company service, you might want to supply some more details. Did you have a specific period between 1862 and 1914 in mind? Which kind of jacket are you thinking of? There were a number of orders of dress to consider.
For example, these are just for the enlisted men of the 13th Hussars:http://www.britishempire.co.uk/forces/a ... rs1903.htm
The Bengal cavalry, I believe, did wear grey-blue jackets. However, from the 1860s onward, for British regiments of Hussars (apart from the 11th) the basic uniform for Home Service was a dark blue. http://www.hussards-photos.com/UK_home.htmhttp://www.gettyimages.co.uk/detail/new ... to/3398110