I just looked at a sign language chart, see attached, so here's my off-the-top-of-my-head thoughts as clue to how this could be done. (Assuming that's the sign language you're using, I suspect there's more than one protocol.)
With a quick look at the digits 0-9 on the chart, it seems that each finger (and when I say finger I include thumb) has only two positions- extended and folded.
So for a sensor, treating them exactly like pots as shown in this tutorial
calibrate the readings into three zones: extended and folded of course, and also an "unknown".
Then read the glove and decide what position each finger is, and Voila!
Over to you... that should get you going? I probably said too much, and deserve the wrath of other posters.
[rant]As is sooooooo often the case, this is a typical example of someone wanting to dive into code without the slightest thought as to what the hell he's trying to do in the first place.