For what it's worth, I appreciate wanting one suit or so potentially for interviews. I work at a firm and while we still dress for work, we are much more casual than when I entered the workforce in 1993. Back then, we needed to wear actual suites everyday and I had quite a few Kaspar and Calvin Klein suits.
I just interviewed and was hired for a more senior management position at another firm. I had to visit and interview four separate days. I wore an actual "suit" one of the days. The rest of the days I wore jackets and skirts (professionally cut, appropriate length). The non suit outfits were all from White House, Black Market. For example one outfit was a grey pencil skirt, a place 3/4 length stand collar jacket and a top with a black and teal print. I wore black patent leather heals and nice jewelry.
I do not see many true suits any longer. These separates are more than fine. In my opinion, nice fitting fashionable clothing with the correct accessories matter more than a it being a "suit."