To create the Guard uniforms, I need to first start with the USS Renegade’s uniform, as the Renegade uniform would reflect a later version of the Guard uniform. It is a three piece uniform with a black undershirt, department-specific tunic, and black pants. Tried to keep it close to the TOS uniform but different. Also the uniforms worn by Commander Straker and Col. Freeman inspired the collar.
This a very rough first sketch.
Original Male base by unknown