There is a Greenwich armour that was made for Henry Frederick, Prince of Wales, during the reign of James I. The decoration of it is very similar to the Cumberland Garniture at the Met, consisting of fleurs-de-lis and Tudor roses, but also featuring Scottish thistles. The background, also, has a sort of dark blue-green shade. I know I have seen a photo of this armour somewhere. There is a portrait depicting Henry Frederick wearing a similar armour, except with knee-length tassets (which may have either been artistic license, or pieces of exchange from a garniture.) But I know that this armour, as it is displayed now (at Windsor Castle, I believe) has tassets and cuisses like most Greenwich armours.

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Can someone link me to a photo of this piece?

Hi Adam!
Do you mean this one?

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bigger here
http://www.royalcollection.org.uk/egallery/ob...il=magnify

YES, that's it! Thank you!

The armour is wearing the manifer, as you will notice. The original gauntlet was taken off and put on George Clifford's armour at the Met.

Strangely, the armour has a green tint to it. Was there a way of "greening" steel, like bluing, purpling, russeting, etc?

I've read somewhere that burning linseed oil onto the surface blackens it and leaves a slight green tinge.
I could be wrong.