A posture correction garment is designed as a compression shirt that may be worn in connection with various activities, such as daily work, exercise, physical therapy, and everyday life and leisure activities. The shirt can include shoulder straps extending from a back portion of the shirt, extending over the shoulders, and removably attaching at a front, upper region of the shirt. The shirt further includes one or more torso straps, extending from a back portion of the shirt, about the user's torso, and removably attaching to a front, lower region of the shirt. Wearing the shirt, by itself or under additional clothing, can help improve one's posture and help correctly align a user's shoulders and spine.