You can disagree if you like, but I saw the costume with my own eyes, without the color adjustments they make on film and publicity photos. It's blue.
Well here's my two cents, that I'll offer to all the points here.
Here's a picture taken at the arclight in Hollywood and a
link to a bunch more taken of all the costumes there. Same place Risu saw it, so maybe we can reach a common ground.
On the issue of the shirt, it really does look off white, I can see the blue hue in the pictures at a distance on the link but as soon as I look at the up close ones I just see white. Not as stark of a white as the shirt in the Graves costume but still white.
That said the pictures prove Risu right about the pants and jacket being different fabrics, so maybe trusting him on the shirt is a good idea. Doesn't matter, if you find a shirt with the pattern, you're already lucky.
When it comes to the waistcoat it reminds me of silk matka, because of the slubs and the weave, but it really could be any raw fabric or blend like Risu said. Although in the film and in these pictures with the changes it goes through with lighting it also reminds me a lot of velvet. I don't know what to make of it, I think this waistcoat is genuinely the weirdest piece of the costume when it comes to fabric, behind maybe only the coat.
And as for the coat, you can see particularly in
this picture there are two different colours in the fabric. Since I was the one who first stated it was dyed here's my
source where the costume designer says it was dyed herself. When I said cotton fabric, I have to admit it was conjecture on my part, although it makes sense because plays tend to use upholstery fabrics all the time and costume designers then continue to use them in film despite their weight and such being slightly impractical.
So if it was dyed then the two colours seem really odd but here's my thinking on that. This sort of diamond weave isn't uncommon, and it is usually made up of two colours. If this fabric started as a white or off white base with cream or tan threads making up the diamonds then the two colours make sense. The base fabric dyed petrol and the diamond threads which were more yellow to begin with became more green coloured.
Aside from that you're probably looking at a custom job to get anything close to the boots and fob because they just seem unique in general. And don't get me started on that bow tie that changes from purple to burgundy to navy throughout the bloody movie, let alone pictures.
Hope i'm some help, I'll personally be waiting to see if this costume carries over to other films before I throw a bunch of money at reproducing it accurately.