I think this is the best answer, plus there are so many ways of subtly shitlording. Go into great detail about how incredibly hard and arduous it is to make a costume for a whale, versus a normal, enjoyable experience of making a regular outfit. Make the caveat clear that the whale outfits are the exception, and the true beauty of your craft can only be expressed in a regular human-sized costume, not a disproportioned, blown up canopy.