Does anybody know what material medieval satin could/would have been?

I believe that modern satin is commonly approximated or confused with silk, but I *believe* that satin is actually defined by a material that has the maximum amount of warp shown on the face of the material, not what fibres the material is constructed from.

Is this correct? And if so, what could medieval satin be woven from, particularly what type of satin would be used to line an "arming" doublet as described in the Hastings manuscript?

Tabby weave- the warp (longways) threads cross over and under the weft (sideways) threads singly.

Twill weave- the weft threads cross over and under warp threads in groups. In this diagram, the threads are grouped in twos. Each row is offset from the row above and below to produce the characteristic twill pattern.

Satin weave- Weft threads pass over many warp threads before crossing under. In this example, the weft threads pass over 5 warp threads before passing under a warp thread.

Because of the long surface "runs" or amount of exposed, uncrossed thread, satin has a smooth finish. The effect is enhanced when a shiney fibre like silk is used.

It can be woven in any fibre- linen, cotton, silk, wool, etc.