Because there are so many different manufacturers and so many styles within each line, within the general outlnes given they can look like almost everything. Think of the breadth of styles that are available today. Even something as simple as an "Armani suit" could come in a half-dozen styles and colors, just in one year's line. Then add in print-on-demand manufacturing and a single designer can offer a single outfit in 20 colors and a dozen slightly different styles. Remember each of the items listed in the rules are a single archetypal example of that item in the world, not the only brand and model available that has that particular abstracted stat line.
If you like the Mortimer of London greatcoat, but it doesn't make sense that your Russian sniper would wear a classic English coat, you can take the same stats, the same cost and say it is a classic Russian-military-inspired greatcoat from Poustovit of Vladivostock. As far as the abstract rules are concerned, they are identical, even if as far as your character is concerned they couldn't be more different.