Because with prototype 44 there where problems with fillings that didn't stay in place an other method of sewing it on is used. This 'final' prototype for testing stayed with the client afterward to test it some more on her own.
Elements of experience:
Positive expected: it moves less then prototype 43
Negative expected: the filling still becomes thinner every time it is used. You can see on the film that when feline moves around the velcro strip on the side loosen up a bit