Thumb method of casting on?

My Aran sweater pattern tells me to use the “thumb method” of casting on. Anyone know what this is?

Here’s one version of the thumb cast on but it’s not a good one for a large number of sts.

Better to use a knit or a cable cast on (see Free Videos tab above, Cast Ons).
I’ve also seen long tail called thumb cast on and that’s a good method to use too.

You don’t necessarily have to use the method recommended in your pattern. You can almost always substitute your favorite cast on.

Unless it’s just a few stitches like for the underarm I wouldn’t use the thumb cast on.