I am all for the idea of dressing above what is now acceptable in many workplaces!
First consideration is, are you considering only suits (top and bottom matched) or do you include outfits with non-matched but upscale/edgy jackets ?
Or both. Either is fun to consider, just much different to shop for matching.
The main problem I have with actual suits is finding ones that fit both top and bottom, even with tailoring. So there are more options in un-matched tailored separates and way more jacket looks. Also, pants suits or skirt suits or both?
And how casual are your co-workers, or those you'd be " compared" with?
If you want to just have your own look, you can do most anything. If you are sensitive to not standing out too much, but just enough, and the going vibe is very casual, I would think you would have tons of room to do things that slightly dress down the suit or even business semi-casual, like juxtapose a sporty shoe with a more tailored suit, or wear a slouchy linen T with suit, or chambray shirt with skirts. As suggested, you can do a more unexpected color in your top than "corporate" usually allows. Then, as Angie said, cropped or ankle pants say more casual, but find the perfect fit and amount of taper, leave off the sandals in favor of a refined shoe, and add a jacket. Shoe styles would be a major thing--would you do high-heeled pumps or would you casualize with loafers, oxfords.
Business not-too-casual, but not corporate, is one of my favorite looks! Angie has several posts of lovely capsules though mostly unmatched jackets and bottoms, there is a very polished vibe to them.