120 in Shein is a standard Large size. This size corresponds to the following measurements: chest - 41 inches, waist - 33.5 inches, hip - 42.5 inches, shoulder width - 16.9 inches and sleeve length – 25.2 inches. This size is suitable for people who are 5’7”- 5’8” tall and have an average body shape with medium bust and hips sizes; however if you're looking for a looser fit then it's recommended that you choose one size up from 120 in Shein (i.e., XL).