Snape knowing it was Harry's cloak

[Caius Marcius]

No: HPFGUIDX 28412

--- In HPforGrownups at y..., Liz <jirrar at i...> wrote:
> >    From: "Cindy C." <cynthiaanncoe at h...>
> > Subject: Re: Snape's and Black's grudges (was: Living with Sirius)
> 
 > 
> > Anyway, when Snape finds the cloak, he doesn't necessarily know 
that 
> > it is Harry's cloak.  Harry is not the only wizard with an 
> > invisibility cloak (Moody has one). For all Snape knows, it might 
be 
> > Lupin's cloak, and Lupin might have used the cloak to sneak out 
if he 
> > were on his way to transform.  
> 
> One theory jumps to mind: It was, I think, originally James' cloak? 
I wouldn't be surprised if Snape recognised it immediately from his 
own runins with WMPP, put two and two together like lightning and 
jumped up and down with glee. In his mind. Any chance to expell that 
dispicable Potter boy would have him in fits...

We know that such cloaks are very rare - as far as we know, no one 
else at Hogwarts has one. And this following dialogue from PoA Chap. 
14......

"Mr. Malfoy then saw an extraordinary apparition. Can you imagine 
what it might have been, Potter?"

"No," said Harry, now trying to sound innocently curious.

"It was your head, Potter. Floating in midair."

There was a long silence.

"Maybe he'd better go to Madam Pomfrey," said Harry. "If he's seeing 
things like --"

"What would your head have been doing in Hogsmeade, Potter?" said 
Snape softly. "Your head is not allowed in Hogsmeade. No part of your 
body has permission to be in Hogsmeade."

"I know that," said Harry, striving to keep his face free of guilt or 
fear. "It sounds like Malfoy's having hallucin --"

"Malfoy is not having hallucinations," snarled Snape, and he bent 
down, a hand on each arm of Harry's chair, so that their faces were a 
foot apart. "If your head was in Hogsmeade, so was the rest of you."

...suggests that Snape already suspected that Harry had James' old 
cloak.

   - CMC