J. Jill clothing is widely known to run large and generous in size due to the brand's signature relaxed, fluid, and comfortable aesthetic. Because the garments are purposefully cut with extra ease through the bust, waist, and hips to provide an unrestrictive fit, many customers routinely find it necessary to size down to achieve a cleaner look. Reviewers and style advisors consistently recommend checking individual garment measurement charts or trying on a smaller size, particularly for their popular knit tops, tunics, and wide-leg trousers.