The Guardian More than a year into the pandemic, some people prefer to keep wearing their face mask – even outdoors in public She’s been fully vaccinated for three weeks, but Francesca, a 46-year-old professor, does not plan to abandon the face mask that she’s come to view as a kind of “invisibility cloak” just yet. “Maybe it’s because I’m a New Yorker or maybe it’s because I always feel like I have to present my best self to the world, but it has been such a relief to feel…