The violet reflective area follows a diagonal upper front. One shoulder remains bare while a long narrow outer area falls from the upper shoulder zone to the ground on the other side. The lower skirt has larger gathered folds beside a high leg opening. A narrow pale waist finish separates the areas. Small upper reflective lines and broad lower light surfaces therefore register as different design choices.
Choose this reference if you want the drawing concentrated above a quieter broad lower area. Record colour, diagonal neckline and opening as separate preferences. Similar upper distribution may exist on an actual garment with another shoulder arrangement. Ask about those real alternatives rather than assuming the photographed model can be altered into them.
Assess the longer side area with arms lowered and while seated on your own candidate. Have its connection explained; this view confirms neither removability nor a material. Add the planned bag to see whether it covers the narrow transition. Decide ordinary length with your shoes before spreading the extensive rear area again for another photograph.