Okay, to start off, the blouse is like this, the skirt is like this(the back like this), but instead of the designs on that skirt, it would be dark green, with the Hogwarts crest, the Slytherin snake, and a silver ribbon separating the crest and snake all at the bottom of the skirt. Alongside the skirt and blouse, would be a tie, similar to this one, but would be the Slytherin colours and have the Slytherin crest on it, and a cloak similar to those in Harry Potter, but a little shorter than those.
That's about the jist of it. I'm sorry I don't have a scan or something.
If this isn't allowed, feel free to delete it.
P.S. I'm asking for the reason of not having any sewing skills what-so-ever.