rose-colored glasses
An unduly idealistic, optimistic, sentimental, or wistful perspective on or about something. Primarily heard in US. I know Sarah looks on our childhood with rose-colored glasses, but I can't put aside how difficult my parents' failing marriage was for all of us. Despite doing worse every quarter for the last two years, our boss keeps seeing the business through rose-colored glasses. You need to take off your rose-colored glasses for a moment and realize that there are serious problems in the world that need fixing.