Invisibility cloak?

[suebaru_27 at yahoo.com]

No: HPFGUIDX 21709

If you watch the scene where Hermione is performing the Petrificus Totalus curse on Neville, you'll notice Ron has a large piece of cloth 
over his right shoulder.  Then look at the scene where a hand pushes open a door to the library, it's a red sweater w/ something over the arm.
Then Harry is in the library looking through the books.  On the counter is the same piece of  cloth that Ron had over his shoulder.  
Could it be the Invisibility cloak?