Button, button, who's got the...

Does anyone know the reasoning behind the traditional "worthless" button on a vest--the bottom button (or buttonhole, at least) that doesn't get used?

I'm crocheting a vest for my sister. The instructions quite clearly tell you to buy six buttons. And make seven buttonholes. Sure enough, if you look at the picture of the vest: six buttons, and--if you know where to look--one lonely, unused buttonhole at the bottom.

I've made the seven buttonholes. But I may buy seven buttons and give my sister the option of buttoning the last button or not--as she chooses. At least she won't be left wondering why there's a hole in the bottom of the front band on her vest.

I felt awful this morning--sore throat and allergy trouble. I went to work anyway, but I came home after a couple of hours. I only had two dogs on the books (for a 10-hour day), and this way someone else can get the dogs and I'll actually make more in sick-pay than I would have made in commissions.

I had worked a couple of rows in Jacey's sweater while I was sitting in the parking lot, waiting until it was time to go inside. After I came home, I worked some on the needlepoint stocking. Then I finished up a crocheted dishcloth (experimenting with a strange pattern--it works okay, but it's unusual). So now I'm working on the vest for my sister, which means I've worked on four out of five works-in-progress today. If I work on the fifth one this evening, it'll be to rip out what I've done: I'm so far over gauge on the width, that I need to rework the piece and leave out at least one set of shell-repeats for either front (which I haven't gotten to) and two sets of shell-repeats from the back (which I've started and worked about 4 inches' worth--of 25 inches). I don't mind redoing what I've done since (a) I'll have fewer stitches to work on the redo and (b) I botched the edges in this crocheting-from-a-chart business, but I think I know how it's supposed to go now.

I'm working tomorrow. I expect we'll be dead all day. Sam and Jacey are going with me to get baths.