The Black Hack: Alternate Armor Rules

I've had this idea rolling around in my head for Armor in an OSR game.

I think it fits closest as a solution for The Black Hack (although I am not sure how armor will be handled in TBH 2E).

Essentially, when you are hit by an attack you roll a d6. If the number rolled is equal to or less than your armor, you take 1/2 damage from the hit (round down).

This does require a reworking of TBH's armor:

Gambeson 1 or less on a d6
Leather 2 or less on a d6
Chain Mail 3 or less on a d6
Plate and Mail 4 or less on a d6
Shield (no small or large) +1 (e.g. If I'm wearing Chain Mail and carrying a Shield, I need a 4 or less on a d6).