Couple years ago I'd say Shirley Manson. Now that goth and grunge is actually dead, not a person but, Serena grom Gossip Girl really gets me these days. Beiges, tans & whites, soft fabrics, effortlessly chic, slightly outdated.
In an ideal world, I'd look like Christina Aguilera in her Back to Basics era. Her style in that era was a seamless blend of modern and vintage.