Is Stormtrooper Armor Art or Industrial Design?

Here's the thing about the case; Ainsworth made the actual helmets for them on spec; he did not design them, someone at Lucasfilm did that, nor does Ainsworth claim copyright on the armor. This case essentially opens up the entirety of film props to be categorized as "industrial design" in Britain and subject to a limit of 15 years, rather than 70 years past the life of the creator. Within the United States, costumes are not eligible for copyright at all, as costumes are considered clothing, which is a "useful article", it is somewhat generous for them to be granting industrial design copyright protection rather than no protection at all.