Traditional striped Saiidi Dresses
They are stretchy (easily 4" /10cms stretch)  and that is what gives their shape when worn.  They are easy to make a bit narrower, if needed, by taking in the side seams a little. 
Size medium (UK size 12/14)
Chest width (unstretched): 35" /92cms     (plus 4+" stretch)
Made in Egypt