Hey there, I went with the blue/cream paisley l/s blouse, gray dress slacks, funky black ponte knit blazer with 3/4 sleeves (allowing blouse to show), and blue suede booties. I felt comfortable and confident and I think it struck the right note, though I probably would have been just as fine in the originally planned black pants suit, as the place was not as casual as I have seen at many high tech companies. I didn't see anyone wearing jeans, for example. So a black pants suit would have been appropriately "slightly overdressed" whereas a matching suit and skirt with oxford shirt and pumps would have been overkill…
The interview room had the AC pumped up high, on a cold day, so I am very glad I opted for the ponte knit blazer instead of the suit jacket, as I definitely needed the extra warmth!
Thank you all for your advice and help!