How about Siamese Twins for next year.
Just stitch together the hip of two sets of pants and the lower part of a shirt so they are still somewhat independent of each other with their arms and legs but connected enough that people will figure it out.
PS, say Hi and Happy Halloween to the boys from Uncle Sean, not that they would remember me, last time you had them here they were just starting to walk and prior to that, you were still prego.
Cheers,
Sean