Cut out a large heart shape from cardboard. The exact size will depend on who is wearing the costume.
Trace the heart onto the other sheet of cardboard and cut that out too.
Paint both hearts pink.
Print/trace an image of the logo onto a piece of computer or tracing paper.
Flip the paper over and color all over the backside of the paper with a pencil.
Flip the paper right side up again and place it where you want it to be on the heart. Re-trace over your original lines and this will leave an outline on the pink heart!
Paint gold.
Attach pink ribbon straps to each side of the heart using hot glue!