"Privates of the Greek Light Infantry Regiment" from Costumes of the Army of the British Empire Charles Hamilton Smith

 Charles Hamilton Smith is a fascinating man - read his wiki. He is known for his Waterloo images.

Foreign Corps in the British Service, Privates of the Greek Light Infantry Regiment, from Costumes of the Army of the British Empire, according to the last regulations 1812, engraved by J.C. Stadler, published by Colnaghi and Co. 1812-15