I haven't used a pattern to make the dresses for my DGD's, I have a size chart that I googled & printed and I'm working from that.
I haven't seen the film but the images I've found show lots of different dresses, so I've gone for a sun dress style with the cape attached at the back, I'm hoping the pretty colour with a sparkly cape will fit the bill for the DGD's
I've made the dresses with ribbon ties at the back to save the expense & stress of trying to sew a zip into this nightmare fabric.
The dress is made entirely from rectangles:-
A large rectangle for the skirt, at least twice or three times the hip measurement maybe more, depending on the fabric used, mine is quite stiff, but if using a finer, more flowing fabric you could use more.
A rectangle for the bodice, the chest measurement plus seam allowance plus ease.
Two rectangles for the shoulder straps.
A rectangle for the cape, this is gathered & attached to the back of the bodice along the shoulder straps.
The fabric cost £25 for 4 mts of the blue & 3 mts of the sparkly. I've made one dress age 9, one age 6 & one age 4. I have enough fabric left to make another dress age 6 & I've only used about half the sparkly fabric.