The Klingons have never worn "utilitarian armor."
Throughout Trek, we have seen numerous times that the Klingon garb was absolutely useless against weapons of any kind, whether they be phasers, disruptors, or various bladed weapons. The TMP-onward costume was just a soft material stylized to look kind of like a suit of armor. It wasn't actually protective armor.
Kor
Throughout Trek, we have seen numerous times that the Klingon garb was absolutely useless against weapons of any kind, whether they be phasers, disruptors, or various bladed weapons. The TMP-onward costume was just a soft material stylized to look kind of like a suit of armor. It wasn't actually protective armor.
Kor