This Hitman 3 game guide video shows how to obtain the private investigator disguise in the Dartmoor level in England. The private eye is Phineas Witmer and you’ll see him at the very beginning of the mission. You can’t attack him just yet, because you’ll alarm the guards. Follow the route from our video to sneak your way inside the manor. Wait for the private eye in the side corridor. Neutralize him, hide his body and take his clothes.
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Important – Neutralizing Phineas Witmer is time sensitive if you want for Agent 47 to meet with Alexa posing as the private eye. It's best to do it at the beginning of the mission to make sure the disguise is obtained before he meets with the mission target.