This was the second time around with this pattern--a top rather than a dress. So I moved the neckline up by about 1". Worked well.
Imogen picked out fabric at a converted post office in Hague, about 30 minutes away, called Prairie Chicks. It's owned by women who have dairy farms!
The bottoms are actually another pattern that is not as wide so they fir onto the narrow fabric (39"). From a British mum of two who wrote this book that includes the patterns. Some are super cute.