Because the intention of fashion is to be noticed, the same purpose as pritzus.
Like it or not when a Chassidic man goes outside of the Shetl and into a crowd of say on the Subway. The long Peyos, The Long Beard , The Long Frock and a streimel is noticed by everyone. That might not be the intention, but it is. It definatly stands out more than a pair of boots