Hi Kevin,
It’s so long since I waved a paint brush I will have a job to find them.
I am still a little lost on the chevrons and colour sergeant’s badges worn on the greatcoat. One guy on the Victorian Wars Forum referred to Downey’s book "The Badges of Warrant and Non-commissioned Rank". He says it states that in 1806 "an order (which also appears to extend the use of greatcoats with distinctive collars and cuffs to the rest of the army, except the Household Cavalry) sanctioned the wearing, on the right sleeve of that garment, of chevrons of the same pattern as were worn on the regimental coat." Then, under the section devoted to Foot Guards, he goes on, “The orders instituting chevrons, introducing greatcoats with distinctive collars, cuffs and buttons for Sergeants, and sanctioning the wearing of chevrons with greatcoats applied also to the Foot Guards. For Non-Commissioned Officers above the rank of Corporal the bars of the chevrons were formed of gold double lace edged with dark blue; for Corporals of white double lace similarly edged." He then goes on to say that if the pattern of badge for Colour Sergeants sanctioned for Infantry of the Line was ever worn by the Foot Guards it would have only been for a short time, being replaced by their own designs. From here on no mention is made of badges on greatcoats until the 1881 regulations. From this it is reasonable to assume that the Guards were wearing gold badges on the greatcoats with the appropriate Colour Sergeant's badge for the Grenadiers during the Crimean War.
Another Lad says that the badges were so expensive that they would not have been issued for greatcoats. Confusing but I have written to Andrew Witton at the Guards Museum a await his comment on the issue.
In regard to the cap, I guess that if the full gold chevrons were worn the cap would have a gold cap band, if not I assume it to be red. Any clarification and detail of the gold pattern you may be able to find would be most helpful Mate.
All the very best Kevin,
Keith