This arrived today. Its a WWI summer weight tunic and cap, the seller says it belonged to an officer in the 73rd Northumberland Regiment.He replaced the cap badge with the one that is on it.
The chin strap buttons look replaced so that leads me to question the originality of the strap. I was under the impression that WWI chin straps were thinner.
I also have been trying to figure out the pattern of tunic that this is. Five button with scalloped top pockets and the lower pockets are the bellows style. Single pointed cuffs and the single pleated seam down the back. It has some features I've seen in Boer war era uniforms and some features from the Pattern 1912 but I've yet to get a definitive answer.
I also have a question about the webbing, I've never seen the Y strap style before. Is this a private purchase style or something completely bogus?