Barbican, London From Balenciaga’s £1,400 faux-filthy trainers to JordanLuca’s urine-stained jeans, designers can’t get enough grimy stuff on the catwalk and this seamy exhibition of it all is a mucky joy to behold Barbican, London From Balenciaga’s £1,400 faux-filthy trainers to JordanLuca’s urine-stained jeans, designers can’t get enough grimy stuff on the catwalk and this seamy exhibition of it all is a mucky joy to behold