Be Linen Movie by Benoit Millot. If you love to look at gorgeous shots of linen from plant to fabric with all the modern machinery and skill in between; if you enjoy listening to French and Italian; if you don't mind the suggestion that hybridizing (or "combining"–genetic modification?) new strains of high-tech fibre flax would be even better, nor mind being told twice that European flax is superior, this is your movie.
I think it's interesting that the farmer says that the best retting takes place in humid growing conditions on fields near the ocean. Also that the processor looks for a blue sheen in the processed flax to know that it is fine flax.
That reminds me, nothing to do with the movie, but with French idoms: in French when you want to say "let's get back to the subject," you say, "let's return to our sheep" or "retournons à nos moutons." Very droll.