@GoodGuyMarko it seems to me that He is the one that shouldnt be there, since his GF asked for advice on fashion, and he told her to go see his childhood friend.
But then again, childhood friend was being a pain in the ass about "eroticism" and "lewdness" and by the end of the chapter she drags him to her changing room while, again, being half naked., and shes surely going to cover that with some bullshit reason like "help me with the bra" or whatever, when he specifically asked her if she needed help from a store attendant.
So yeah, this girl really needs to go, the character is shit, her reasoning is shit, she is full of shit, and its not really helping advance the story, or even make it interesting.