You know that effortless look certain women have when they're walking out of a Madison Avenue cafe? The kind where the dress skims rather than clings, the fabric looks expensive (even up close) and nothing pinches at the waist after lunch. That polish doesn't come from squeezing into something restrictive. It comes from knowing what actually flatters. To help you on your journey, we rounded up loose, slimming dresses that channel rich Upper East Side energy without the high price tag.