A resounding yes! I would guess like SF, in Seattle even the stuffy people at the opera are used to seeing interesting outfits. In fact, that is part of the fun of going to the opera.
I would wear sheer black hose under them for warmth and a dressier look. Also, if your footwear is more refined rather than tough or chunky, it will be opera-OK.
I could see these with a tunic mini dress over them, or like they are shown on the model with a tucked in shirt and maybe a blazer.
ETA should have read the thread first! Sorry they didn't work. They are beautiful.