I don't have a pattern for the shawl and try to muddle my way to something that looks sort of like what I want.
The problem I have with this is that when you decrease on both sides while knitting stocking stitch, it will not result in a 90 degree angle, in something a bit pointier than I'd like.
Through trial and error (and a little bit of actual thinking) I figured a decrease in every right-side row PLUS a decrease in every third wrong-side row (a total of four decreases in six rows), should get me the angle I'm looking for.
Looks like I've got it sort of right now.
However, as my first attempt (as seen in the previous post) was not what I wanted, I frogged the other side. Not being one to waste perfectly good yarn, I wrapped them all in nice little balls.
As I actually will knit less rows now to get to the end (the stripes are somewhat narrower now), I should be fine.