A great number of stores, having a deficit of free time and a lack of an accurate structured knowledge about your individuality, colours, styles, etc. creates stress.
Fatigue after a long shopping trip, confusion at the sight of a wide variety of choices, and wasted time spent on trying on wrong clothes result in a lot of frustration.
Even if you are lucky enough to find beautiful pieces, they do not work with what you already have in your wardrobe. Often you even have to return clothes or accessories you like because you do not know how to put together nice outfits with them.