Let's talk a little bit about head gear:
In old army pictures I only saw tricorns, the bicorns were worn in the navies following the British example.
Some pictures of Grenadiers and their caps:
Hessian (Rgt v. Ditfurth)The regiment fought in America, 1776 - 1783

Hessian (reenacted)

Swiss A fine example of a fur lined grenadier cap, maybe the Royal Welch Fusiliers had a similar one?

Prussian

Russian (Pavlov's Grenadier Regiment)

Prussian (1. Regiment Foot Guards) and Russian (Pavlov's Grenadier Regiment)

British

British

60th Royal American And here a sample of the hat cut back. It follows the grenadier tradition of brimless headgear to be better enabled for throwing the grenades.
And here some observations of the name grenadier:
As Cpt Graves writes in his memories, the title grenadier was held a name of honour with the old grenadier units albeit they had abandoned the use of the hand grenade. When this device came in use again in the trenches of WWI, the old grenadiers watched jealously over their title, and the guys actually throwing the grenades (or "bombs") were called not grenadiers, but bombers. One of the marvels of the new German army is that the foot soldier is called armoured grenadier (Panzergrenadier, even when he is motorized) and is fighting like a light infantrist (Jäger)
By the way, Guest,23rd - guessing from the number, could it be that you are or have been wearing the flash?

Wilfried