It's always a good sign for the local shopping scene when national retailers pick the Twin Cities to test new store concepts. The latest to land at Mall of America is Martin + Osa. It's American Eagle's answer to everyday luxury for thirtysomethings. (I walked out empty handed, but my seventysomething father bought a khaki jacket. He's an unusually stylish grandfather.) To me, it's American Eagle meets J. Crew -- slightly preppy basics in finer fabrics with a few twists, like a nylon trench coat in pale yellow and "chino sweats," with the fit of khakis and the softness of your coziest sweats. Saw a hooded sweater I liked, but $98 seemed a bit much for it. Still, it's worth trying something on. The fitting rooms are a zen oasis in the middle of the mall.