This is an important exercise. Visit as many stores as possible. One can observe the window display, the play of the theme, the colors of the clothes on display and the harmony. See how different brands project different images. For example, compare the window display of Mango vs. the window display of Bossini.
The floor plan, the pricing, everything plays a part in making a brand successful. As a designer it is important to understand these nuances of the fashion business. Pics of shop displays.