Got a Real-World Weapon or Armor Question? Mk. IX

[GungHo]

Could you wear brass knuckles and still be able to grapple or wield a sword effectively?

Not really.

Even at their most basic, common brass knuckles restrict the spread of your fingers and feature a palm grip that helps the wielder stablize their grip and prevent tearing up their own fingers/hands. You have no way of spreading your fingers to grab someone, and the palm grip would preclude you from holding onto the hilt of a sword.

That being said, there are some knives that have knuckles/dusters integrated into the grip, such as trench knives, though those are really to protect your fingers and help you hold on to the weapon rather than punch someone inna face.