I also made this Groom Cake for my daughter's wedding. It was very simple. I made a two layer cake using 14" pans which I covered it with buttercream as well as a single layer 6" cake. I used a sheet of black foam to make the tuxedo. I cut each top edge to make the "V" when it was put on the cake. I then attached it with buttercream, added black fondant buttons and a bow.
I cringe when I look at the top of the cake! I do a much better job of smoothing the icing now. This cake and the wedding cake in the previous cake were made just a few months after I completed the Wilton cake decorating course.