A wearable device (100) for monitoring body posture, comprising a housing (101), a fastening means (102), sensor devices for measuring changes in a user's body posture, a processing unit for collecting and processing signals from said sensor devices, and a feedback device for receiving output signals from the processing unit and providing posture feedback to the user, wherein the fastening means (102) secures the housing (101) adjacent to a user's sternum (S), a first sensor device (103) delivers a signal related to an actual distance (X) between the housing (101) and a user's chin (C), a second sensor device (104) delivers a signal related to an actual inclination (α) of the user's sternum, and the processing unit (105) decides when to transmit a control signal to the feedback device (106) causing it to provide posture feedback to the user.
