And speaking of clothes made of curtains...

We were watching Sound of Music tonight, and I wondered: Maria makes the von Trapps one set of play clothes from the curtains, but where do the other ones come from? In the "Do, Re, Mi" sequence, they all wear a few sets of clothes, but the housekeeper only gave Maria enough to make dresses for herself. Where'd she get the rest of the fabric? Was it a pre-Tim Gunn, "Make it work" moment?