First, with right sides facing, sandwich the back piece between the two yoke pieces (yoke and yoke facing). Pin, sew and press.
At this point, most commercial pattern will tell you to press under the raw edge of the facing and stitch down along the edge. But, if you look at most ready-to-wear clothing, yokes are not attached this way and are instead self enclosed. To achieve this look, turn the yoke facing so that the right side of the facing and the right side of the shirt face each other. Line up the raw edges, pin and sew. This creates another sandwich. It also twists the shirt which can be awkward, but leaves plenty of room to sew.
Grade the seams, turn yoke right side out and press.
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