This time about something that is quite well known: the picking up + knitting of stitches on the edge of any knitted fabric:
And when working a sleeve in top-down constructions one does not have to bother with the CO showing through, since the stitches at the underarm are picked up at the row below, while the resulting underarm-seam is sturdier, too.
I even go as far as to pick up stitches at the second "column" of stitches - if I find that the edges are looser and floppier than usual: the whole idea is to give my new set of stitches a firm "foundation", so that they are as tidily joined to the other piece of fabric as possible.
Since I am not really bound to the edges I can also straighten wonky necklines out or other little mishaps with this method - I just pick up the stitches that would form a perfect line or curve and leave the not so perfect edges dissappear on the wrong side of my work...
This tutorial has been added to my other PDF files - you can check them all out here if you like, or just click on the picture to open up the file in better resolution.