The film takes place in England, a country not known for its warm climate. And with the fuel rationing necessary because of the war people are wearing sweaters in nearly every scene. Beautiful intarsia, fair isle, the aforementioned sweater vests, etc. JUMPERS, as our friends from the other side of the pond would say. Jumpers as far as the eye can see.
A Google search for pictures is very disappointing, but I assure you it is worth the price of the ticket to not only see an amazing movie, but to feed your yarn lust with early 20th century knitting on display.