Rin's funeral dress. 

http://www.google.com/search?q=Black+dress&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAmoVChMIjIX3uvryxwIVgriACh38sAvA#imgrc=Irzv3SpkCXLvdM%3A