Fit Fam says these run true to size but with that classic roomy, relaxed Tibi ease through the waist and hip, so if the elastic poofs a bit at your usual size, sizing up gives a flatter lie. They're loving the lightweight, breezy feel and easy-to-dress-up-or-down vibe—tossed on with a sweatshirt for day or styled up with heels and a cardigan for dinner.