A posture improvement device provides neuromuscular stimulation or proprioceptive therapy using a combination of pressure, torque and angle simultaneously applied to a user in order to train body muscles for proper posture through muscle memory. The device comprises a garment designed to be worn by the user, which is preferably configured like a short-sleeved undershirt or T-shirt. The garment may be fabricated of a stretchable, yet taut material in order to provide the desirable form-fitting feature such that pressure may be readily applied to the surface of the skin for neuromuscular stimulation. This elastomeric material is also preferably breathable and/or which has moisture wicking capabilities.