MOVIE SPOILER - Tom Riddle

[Carrie Williams]

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I saw the movie yesterday, and there's one thing that's really 
bugging me - Tom Riddle's robes. I re-read CoS last year just after 
seeing the first movie, and was thinking of how it would look on film 
the whole time I was reading it. What occurred to me was that in the 
diary scenes we would see Tom Riddle/Voldemort at school, and would 
then have definitive information on what house he was in, from the 
crest on his robes. So I was taking particular notice of his robes in 
those scenes. Now, as we know, Riddle was a Slytherin - Hagrid told 
us so. So, in that case, why does Riddle have on his robes not a 
Slytherin crest at all, but the Hogwarts crest like the first years 
have before they're sorted? Not only that, but he was wearing what my 
sister insists is a Ravenclaw jumper - with a blue stripe round the 
neck.

I have a couple of theories:
1 (the paranoid one): they are hiding something from us! Riddle may 
turn out not to have been a Slytherin at all.

2: Riddle created the images he showed Harry in the diary, and he 
simply replaced the Slytherin crest on his robes with the Hogwarts 
one because he knew Harry wouldn't trust a Slytherin.

Any other theories on this will be gratefully received - the more 
outlandish the better!

Carrie1138, who thought the duelling club scene was the best in the 
movie, but missed the Malfoys in Knockturn Alley and the Arthur 
Weasley/Lucius Malfoy fight, and the de-gnoming, and... too many 
things to list!