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I was going to write a tutorial for how I finish a facing around a zipper. However, there are several excellent tutorials already illustrating this technique on Sigrid's sewing tutorial site (which is a superb resource, if you don't already know it), so I decided not to reinvent the wheel.
In particular, I recommend Sherry's clearly-illustrated tutorial. This technique can also be used to finish the top of any zipper opening. Kathleen Fasanella has published a great set of instructions for finishing a lapped zipper and centred zipper in the same basic way. Another variant is the faced fly front zipper - I shamelessly recommend my own tutorial for that, which is also linked at Sigrid's site.
To the left, you can see how neat and clean the inside is, as a result of this easy technique.
Understitching securely attaches the enclosed seam allowances to the inside layer. To understitch a curved edge like the neck or arm opening of my dress, first trim and grade the seam allowances. I'm not a fan of clipping because little corners may form where the clips release the tension. Trimming results in a smooth curve. If you trim aggressively (leaving about .7cm or .25", or even less) the seam allowance will easily stretch enough so that the edge won't pucker or refuse to press flat. If you are understitching, there is no reason to worry about the small seam allowances compromising the strength of the seam.
If you don't already use this technique in your sewing, I highly recommend it!