I had the same thought. Shouldn't it be our SKIRTS?
If you talk to yourself in the 3rd person (like smeagol) then this is a perfectly normal sentence. eg. "my precioussss"
wouldn't it be "our preciousss" then?
Maybe they share the skirt! :P
Maybe they share the skirt. Maybe it's someone talking on behalf of a skirt store. Use your imagination.
should be Unsere Röcke sind schwarz, I guess
A fashion team developing the latest skirt model replies indignantly to a request for a yellow one: "Unser Rock ist schwarz! "
Why is it "Unser Rock" and not "Unserer Rock"?
In English,it is more natural to say Our skirts are black otherwise it indicates that more people share the same skirt and that's kind of strange;-)
Is that Our Majesty the Queen talking? (Nb : I don't see her wearing such a sad piece of clothing, apart from at a funeral!)