can't really think of a Название for this

when harry was sorted,it shows he has all his stuff(gryffindor robes,tie and scarf).but they don't know what house they are going to be in when at madam malkin's robes for all occasions,so how did he get them so soon.do Ты think he got them at hogwarts,do students write letters to their parents and have them send it или what


i wanna know what u guys think.because i'm completley lost.