The author recommends using either Utopia, Encore or Nature Spun brand yarns.
Although these yarn recommendations are concerning the Sorcerer's Stone/Philosopher's Stone Style Hogwarts Scarves, they may be used to knit a variety of garments in the Sorcerer's Stone/Philosopher's Stone style.
Utopia
Gryffindor -
187 Maroon or 153 Pomegranate (MC)
176 Maize (CC)
Slytherin -
144 Forest Green (MC)
71 Soft Grey (CC)
Ravenclaw (film) -
77 Air Force Blue (MC)
71 Soft Grey (CC)
Ravenclaw (book) -
77 Air Force Blue (MC)
30 Cognac (CC)
Hufflepuff -
104 Black (MC)
176 Maize or 335 Sunflower (CC)
Encore
Gryffindor-
212 Pomegranate or 999 Burnt Sienna (MC)
1014 Butternut (CC)
Slytherin -
hunter or 1234 Dark Forest (MC)
0130 Grey/Oyster (CC)
Ravenclaw (film) -
517 Delft Blue (MC)
130 Grey/Oyster (CC)
Ravenclaw (book) -
517 Delft Blue (MC)
175 Cognac (CC)
Hufflepuff-
217 Black (MC)
1014 Butternut or 1382 Bright Yellow (CC)
Nature Spun
Gryffindor-
200 Bordeaux (MC)
308 Sunburst Gold (CC)
Slytherin -
N25 Enchanted Forest (MC)
107 Silver Sage (CC)
Ravenclaw (film) -
N36 China Blue (MC)
107 Silver Sage (CC)
Ravenclaw (book) -
N36 China Blue (MC)
N94 Bev's Bear (CC)
Hufflepuff-
601 Pepper (MC)
305 Impasse Yellow (CC)
Credit
© Laura Kent's supply recommendations were taken with permission from knit.atypically.net.