For the cloth, I lifted/adapted a bunch of paint recipes from Eavy-Archive.com and tried my best to match them to a list of medieval dyes. I found the PDF linked from Andy Hobday's excellent "Painting the Past: Uniforms in the High Medieval Period" post on his site, if you wanted to see the original images.

My aim is to post a recipe for every colour mentioned in the PDF, eventually. This guide is an ongoing project, so if there is just a name listed below, I haven't got to it yet.

Elderberry (Leaves) & Iron

1. Basecoat with Castellan Green .
2. Take some Caliban Green and thin it with a little Lahmian Medium . use this paint toadd soft shading in the recesses.
3. Pick out all of the edges with Loren Forest .
4. Finish by selectively highlighting with Nurgling Green .

Tansy (Flowers) & Iron

1. Basecoat: Doombull
   Soft Shade: Khorne Red
   Shade: Khorne Red / Black 1:1
   Highlight: Doombull / Zamesi 1:1
   Highlight: Zamesi
   Highlight: (if needed) Zamesi / White 1:1

Tansy (Leaves)

Broom & Iron

Tansy (Young Leaves)

Elderberry (Unripe Berries)

Weld & Iron

Woad & Weld

Gallnuts & Iron

1. Basecoat with 4:1 Abaddon Black and Kantor Blue .
2. Mix the base colour 1:1 with Administratum Grey , then highlight the cloth.
3. Increase the amount of Administratum Grey to 1:2 within the mix and highlight more selectively.
4. Finish with a few specular Grey Seer highlights.

Madder, Iron & Woad

1. Basecoat with 1:1 Dark Reaper and Skavenblight Dinge .
2. With a 1:1 mix of Dark Reaper and Abaddon Black , shade the recesses of the cloth. I like to thin this paint with Lahmian Medium to soften the shading, then do a second pass for particularly deep parts.
3. Take your Dark Reaper and Skavenblight Dinge base colour and mix it 1:1 with Administratum Grey . Now pick out edges and folds.
4. Increase the amount of Administratum Grey in the mix to roughly 1:2, then more selectively highlight.
5. Finish with a few small highlights of pure Administratum Grey .

Woad (Urine Vat)

1. Basecoat with Dark Reaper and Administratum Grey mixed 1:3.
2. Shade the recesses of the cloth with Dark Reaper . I like to thin this paint with Lahmian Medium to soften the shading, then do a second pass for particularly deep parts.
3. Take your Dark Reaper and Administratum Grey base colour and mix it 1:1 with White . Now pick out edges and folds.
4. Increase the amount of White in the mix to roughly 1:2, then more selectively highlight.
5. Finish with a few small highlights of pure White .

Woad

Gallnuts

Wallnuts (Green Husks)

Wallnuts (Green Husks)

Wallnuts (Green Husks)

Buckthorn (Bark) & Alkali

Oak (Bark)

Buckthorn (Bark)

Madder & Iron

Madder

Madder, Apples & Alkali

Madder & Copper

Madder (Fermented)

Madder & Apples

Madder, Iron & Woad

1. Basecoat with Khorne Red .
2. With a 1:1 mix of Khorne Red and Abaddon Black , shade the recesses of the cloth. I like to thin this paint with Lahmian Medium to soften the shading, then do a second pass for particularly deep parts.
3. With Wazdakka Red pick out all edges, corners and folds. You may even want to add a few scrathes on open areas, to add a little visual interest.
4. Mix your Wazdakka Red 1:1 with Karak Stone , then more selectively highlight.
5. Finish with a few small highlights of pure Karak Stone .

Weld

Celandine & Copper

Alder (Pines)

Tansy (Flowers)

Lady's Bedstraw (Flowerrs)

Broom

Gorse

Yarrow

Broom & Alkali

Madder, Iron & Alkali

Madder & Wood

Madder, Apples, Iron & Alkali

Oregano (Flowers), Malt & Apple (Leaves)

Madder & Alkali

Tormentil (Rhizomes) Fermented

Madder & Alkali