Ok. Your period should range from about 1880 to 1914. So I have reached into my collection and found the following books to look up and use in painting.
1. Hussars and Mounted Rifles Uniforms of the Imperial German Cavalry 1900-1914 By D.H.Hagger paper back printed in 1974 Almark publishing
2. Lancers and Dragoons Uniforms of the Imperial German Cavalry 1900-1914 By R.J Marrion paper back printed in 1975 Almark publishing
3. Cuirassiers and Heavy Cavalry By D.S.V.Fosten Hard Back printed in 1972 Almark.
All these books are great with lots of information. Second are more pricey .
1.The German Cavalry Uniforms and Equipment from 1871-1914 Hard Back By Verlag Militaria
2.Imperial German Hussar By Shiffer Publishing.
All these books should help you Willie