The Halocho utilizes expression of “Your Shabbos clothing should not resemble your weekday clothing” rather than some expression of keeping an extra set of clothing for Shabbos.
In light of this phrase, and in light of common usage being that Shabbos garb for most people implies a business [lounge] suit & white shirt {& tie & hat}, hence on weekdays I make a point of not wearing a suit & white shirt; Consequently during the week, I wear either a suit with a color shirt, or white shirt with Blazer & pants (& tie & hat}.
To me this Halocho is more significant than some so called yeshivish uniform.