[TOP] Fletcher’s very early concept sketch for his armor-plated Klingons.

[MIDDLE] A modified design for the Klingons’ reintroduction in Star Trek III: The Search for Spock shows the inclusion of spinal armor; the realized spinal armor.

[LEFT Klingon costume from Star Trek: The Motion Picture.]

[RIGHT] Commander Kruge (Christopher Lloyd) models the finished Klingon battle armor.

Star Trek Costumes: Five Decades of Fashion from the Final Frontier, Paula M. Block and Terry J. Erdmann