Ok, so, thinking about this shirt:
If it were me (and it wouldn't be because orange is probably my worst color, so I'll imagine it's a different summery bright , I would want a topper that said "grown-up arty" -- a neutral for sure, maybe not black (too Halloween), but it could be grey or white or olive or denim... For example: https://www.etsy.com/listing/5.....t_relevant
Alternately, a chunky long cardigan/coatigan/swacket type thing, like kkards mentions. http://www.hm.com/us/product/7.....j9wGzN-5yR
I think this top has enough going on that I'd be inclined not to pattern-mix with it, especially if I were going for a toned-down professional look.
I like the idea of the blue skirt, but you could easily do jeans or other slim pants as well. White jeans would probably look amazing, although maybe too casual for your target environment. It's hard to say though, as definitions of business casual seem to be very different from region to region, and even within a given region. Maybe this is a Friday top for an office that does jeans-on-Friday? I guess the question is how much you want to make this top work as part of a "career" capsule, and/or do you love it enough to keep it even if it ends up being a weekend-only piece in the long run?
Also, re: sales (maybe this is a matter for a separate thread), I absolutely started out here thinking that I would never pay full-price for anything. And I still use discounts on most of my purchases, opt for secondhand when possible. I also have a pretty low price threshold relative to others on the forum, I think. I prefer to keep any individual purchase under $100, the only exceptions being outerwear and footwear. So I do see a lot of things I love, and file them away for "if it goes on sale/if I can find it on eBay/etc." A lot of the retailers that do mega-sales -- J Crew, Loft, the Gap brands, etc -- I just don't find things I love at those places right now. So I target the brands that do work for me. Off the top of my head, that's Uniqlo (very reasonable initial pricing), Everlane (again, less of an initial mark-up than mall brands, and they try to under-produce rather than over-produce), and Boden (pretty much always possible to find a promo code for 15-20% off, plus free ship/returns in the US).
What I avoid is sale-shopping in the sense of "Oh, this top fits well, it's marked down in a hideous colour, but I don't want to pay the extra $ for the better colour so I'll settle for the cheaper option." I find that the vast majority of items I consign or donate were purchased in this manner. So I'm training myself not to do it. If I end up not wearing the item and getting rid of it, I haven't actually saved any money by buying the on-sale version. Seasonal colour analysis really opened my eyes in this regard -- how worth it is to find the *right* colour, not settle for the almost-right one.