Gryriffindor Ties And Clothing Differences:

When you talk to other students, look at their ties. Everyone has a Gryriffindor tie, with the exception of Malfoy, Crabbe, and Goyle (whom have different ones). Also, there are only two people with their shirts out, which are Ron and Seamus, and with either Crabbe or Goyle, only one has a school jumper on.