Identify this uniform

[gregory128]

Hello, so i have recently bought this greatcoat in hope of displaying it with my kuk shako. Only catch is that my knowledge on axis uniform is quite limited since the research material is quite niche if you do not speak the native language. I was wondering whether anyone can identify the following: Usually i specify on British 19th century frocks and tunics, however iv decided to set up a small WW1 exhibition in my local town. I am also wondering whether the shako is correct for the greatcoat and if not what would a valid replacement be?

http://www.ebay.co.uk/itm/251822461766? ... EBIDX%3AIT

My shako looks like the attached but without the badge and leather strap (Although it may have had one in the past). Also the button is plain.