This MUST be a massive troll by the Daily Mail.
Even if those ARE the actors hired to be the "dwarves"...and I don't see any of them on the IMDB page (which may be incomplete), there is NO FUCKING WAY those costumes pass muster. Even a porn parody has better design aesthetics and construction than that shit! I've no doubt this film will be dogshit from a writing perspective but the rest of the team on these projects is still a professional bunch.
Even if these are all stand-in extras wearing slapped together outfits for a shot by a drone 10,000 feet high, that riot of color, clashing styles, and ZERO cohesive or storytelling value even in prop clothes just isn't how a high profile project works.