Enter the tailor's shop and 47 will tell the tailor he needs a new suit. Follow Tommy up the stairs and take a right to find your new suit. Grab the suit and put it on. When you're dressed, leave the shop to finish the mission. There are no challenges but there are several items in here that you can pick up if you are a completionist.
In this room will be a bust on a table near some chairs. Go downstairs and hug the right wall to find the boiler room. Inside you can find a fire extinguisher and a Metal Pipe. Turn right into the next room to find three costumes on mannequins. Change into each of them and then check to the right for some scissors. Go between the boxes and you'll find a desk. On the shelf above will be a book and on the desk itself will be a piece of Evidence. Grab the measuring tape off of the safe and to the left of it on a chair will be the chicken suit. Change into that. Turn around and on one of the boxes will be an iron. Grab the iron and then you can leave. You should have gotten everything now.
