T-shirt storyline?!

Does anyone remember somone buying a black t-shirt from some indie shop.. she was a mte of Reginas sister.. I was pretty young so I've kinda forgotten their names.. and then she tried it on in teh Byker toilets and it left dye on her or something?! Then Reginas big sister came in and they sort of cried.. Im probably wy out.. I just always remembered that..and wondered what it was?!