If the Laennec size 36 fits you loosely then yes, you will wear the same size in the H.W. Cushing. Overall the H.W. Cushing is narrower than Laennec in the shoulders and torso, yet comfortable, ergonomic and functional. Both the H.W. Cushing and E. Wilson are slim fit styles v. the classic-fit style of the Laennec. However, if the size 36 Laennec fits loosely only in the torso (not the shoulders) and you have especially broad shoulders, you may need to try on the size 38 Cushing.