I have used a lot of baby wraps (have worn all 3 of my children over the past 7 years) including the moby, I wouldn't want a knit one, personally.
IMO, the Moby is great for a very young baby. After about 15lbs, it stretches too much, and you have to keep re-tying it. Then a woven wrap, or a different carrier, works better.
However, if you were to knit one, diagonal stretch is best (most baby wraps are woven, and have this diagonal stretch) followed by vertical stretch - horizontal stretch is awful, and will be mostly unusable (you'd have a heck of time tying it tight and secure). I have not knitted enough yet to know to knit without stretch, or minimal stretch, but maybe someone else can chime in.
Knitting homeschooling mom to 3 kidlets
Bayerische Socks by Eunny Jang in Knit Picks Risata (for ME!)
in queue: Swirl glittens; lacy raglan for me; new cabled sweater for dh
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I've seen a pattern for a crocheted pouch sling, but not a wrap.
You could always knit and felt to avoid the stretch. Or you knit it small enough so that the stretch is what makes it wearable (which is what the pattern for the sling did).
Doing that, I'd probably make it out of cotton... my cotton pieces seem to stretch less than acrylic or wool. Just allow for shrinkage. I'm thinking knitting the wrap in garter stitch and the center portion in a rib to allow a bit of stretch where the baby would be. Although stockinette seems to stretch less than garter... and knitting a border on it would keep it from curling. Also remember that knitting generally stretches more in one direction than the other.
Now that you mention it, I'm thinking about knitting and felting a mei tai.