What is the fiber content of the yarn you used? That is quite a stretch for the smaller ones, but if they are knit loosely it's worth a try. You'll have to soak them then lay them out and measure and pin to size.
Some fibers may not want to hold that size when dry. Sewing will hold them a bit as well so if you can block them some it might be fine.
I haven't tried this so hopefully someone else can chime in soon.