The myriad ways bakers can theme cakes to an event is one of the reasons why they are such popular menu items for parties. Choosing a shirt as the base design of your cake gives you many options when it comes to decorating. Create a Hawaiian-style shirt for a bon voyage party, a business shirt for Father's Day, or a college T-shirt for a graduation party. Though there are cake pans in the shape of short sleeve shirts, trimming a standard rectangular cake is just one extra step.
Bake the cake in a rectangular cake pan following the recipe.
Cool the cake thoroughly. During that time, prepare the fondant and any other embellishment you will apply to the cake.
Remove the cake from the pan and place it on a platter or tray.
Orient the cake in front of you so that it is longer side-to-side. From the lower left corner of the cake, measure one-third the length of the edge. At that spot, cut a 3-inch vertical line into the cake.
Line up the knife between the corner at the right end of the cake and the end of the 3-inch line. It will appear to be the shape of a long, narrow right triangle. Cut the triangle piece off the cake and discard it.
Repeat the process on the other side.
Trim at the top of the cake to shape the sleeves and neckline. Cut off the top corners at a diagonal to round the shoulders. In the centre of the top edge, cut a 5-inch gradual curve to form the neckline.
Apply a light layer of frosting to the cake with the offset spatula.
Roll the fondant to 1/8-inch thickness and so that it's long enough cover the length of the cake.
Loosely drape the fondant over the rolling pin to transfer it to the cake.
Smooth the fondant with your hands, from the enter of the cake out, then down the sides. Press the fondant at the base edge to make sure it adheres to the frosting.
Trim any excess fondant coming off the cake's base. Use a fondant shaping tool or a knife.
Apply cake decorating paint, cut pieces of fondant or other embellishments accordingly to match your theme.