"Ele veste um traje militar."

Translation: He wears a military outfit.

[ThanKwee]

"He wears a military uniform" was also accepted.

[DanielTietz]

military uniform = farda

[tu.8zPhLD72zzoZN]

as fardas militares = the military uniforms

[EdgarKHXZ7]

imo 'He wears a military gear' should be accepted

[Scutigera]

Gear is a bit of a stretch, though it can fit. But as a collective noun the indefinite singular article does not work. He wears military gear, or He wears some military gear, works, but I do not know that it is keeping with the spirit of the sentence exercise here.