pklima, if keeping the lines square to the body is a problem, you could try putting it at an angle on purpose. Say, around 30 degrees. Then it would look like it was on purpose AND you wouldn't have to worry about lining it up with anything.
While playing the instrument, the angle could give a suggestion of looking like you had a Burberry (or whatever) sash on.
While playing the instrument, the angle could give a suggestion of looking like you had a Burberry (or whatever) sash on.