Jacob Vardy
Explorer
For under your armour? Sure. If you have unlimited funds. And don't generally mind worker exploitation - but then, if you're rich enough to afford armour, that generally goes without saying.
Silk padded armour and armour padding was a thing.
Silk was only really expensive in the Far West. If you had access to the South China Sea or Indian Ocean it was much less so. Nor am i aware of it being more exploitative than linen. Pre-industrial mass manufacturing of textiles was pretty much always exploitative.