Alias is correct; except in the very rare circumstance, you cannot make the stripes line up on the collar/lapel seam. There are three reasons for this -- first, assuming you align the collar pattern with the back of the jacket (and you definitely want to do this), then you are unlikely to get the stripes aligned with the lapels, just due to the geometry of the matter -- what you will get is symmetry of the two collar/lapel seams, which is certainly desirable. Second, even putting aside the matching in the back, imagine matching the fabric up at one of the seams; how likely is it that the other seam would match up, given that the collar is a continuous piece of fabric. Only in the rare circumstance in which the length of the collar fabric happened to be perfect for the given fabric/pattern would the second seam match up. Now, if you made the collar out of two pieces of fabric, joined at the back, then this would be different, but then the pattern wouldn't match the back of the jacket, which would look worse -- given that the back is a large, flat surface, the discontinuity would be readily apparent and look bad. Third, the only way the fabrics would match across the entire length of the collar/lapel seam would be if they were (the collar and the lapel) cut at a 45 degree angle relative to the pattern; otherwise (simple geometry) the distance along the seam between the stripes would differ for the lapel and the collar, and therefore the stripes would not match up along the entire length of the seam. Depending on the location of the gorge and the desired shape of the lapel, this is difficult to do -- certainly for a notch lapel, perhaps less so for a peak lapel since the seam is not continued straight into the notch.