I don't think that is lead paragraph and there is no written evidence / reference for other participation so how can me or you write they all made cloths by cotton , and same category Haute couture how can we write about others , we have reference only mentioned about his work what he did in the show there is no written evidence about others so you should not edit this line and that was lead line , that was very special , there is no written information about other contestants the grand finale collection so please do not change . 

and As for the category its totally different thing Costume Designer is very different from fashion designers , and please first talk on talk page after that do changing.   WP:3RR