These sketches were done as a result of a question by donnydl on the Ravelry group - thought they might be useful here for reference.
If you have a garment that is too wide you mirror the missing bit on the edge of the paper - "fold" the garment drawing in a definite place eg 60 so that the extra bit is easy to work out. Of course, make sure you have enough needles too! See picture below, the missing bit is hatched in the second picture.
If you are knitting an assymetrical garment and do not have a wide enough sheet, you can mirror that line about zero. This is a rough sketch of a ballet wrap top - the front neckline is in red, the sleeve is in blue: