Osprey is not much help for colour description, they only describe the smock as green. My other reference book by John R. Angolia, describes it as an olive-green water-repellent gabardine fabric.
Should be noted that the Army and Air Force had intially created their own paratroop forces, but in January 1939 the two were joined together. This could explain some variation in smock colours, but is just as likely a slight difference in sourced material colour.
Trousers are described as heavy field grey wool. 2nd model were constructed of normal weight field grey material.
Jump boots were of black leather, thick rubber soles, and laced up the outer sides via 12 pairs of eyelets.
Gloves were dark brown leather.
Splinter smocks did not make an appearance until the following year with the operation over Crete - but even here was still not widespread.
No mention of desert coloured, nor SS camou style, jump smocks.
regards,
Jack