1649
Some heroes don't wear capes
(lemmy.dbzer0.com)
I use Arch btw
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It won't stop a direct shot, but it would help against ricochet and shrapnel.
Back during the Napoleonic wars, silk underlayers were highly sought after. They could limit the damage a musket ball could do.
A spider silk based cape could definitely help projectile damage, while still being able to billow. The challenge would be making it fire and heat proof as well.
It's more of a projectile resistance than full proofing.