It is useful, but it makes the assumption that the neckline of the garment does actually start at the base of your neck. Most shirts do this. But quite a lot of women's wear does not start there. Necklines can be much more open than that. If a garment doesn't start at the base of your neck you need to know your measurement from your centre back to your wrist, and use that measurement to adjust your pattern I think.

I really appreciate these videos though I have been sewing for years, but I found this one a bit disappointing. I thought it would be about sewing knits. I have read the articles on knits too, but have nowhere found a solution to my problem - sewing a very "boingy" knit which rejects all stitches even though it is interfaced (the pattern calls for sewing through three layers).