Knitting

Knitting uses a pair of needles to transform a long ball of thread into a tightly-looped fabric that is flexible and warm.

Knitting-like techniques

Naalbinding could easily be mistaken for knitting if you've never done it - the technique actually uses a needle and short lengths of thread to create the thickly looped fabric. http://www.stringpage.com/old/basicnaal.html

You can knit all sorts of great stuff for winter for the SCA, such as scoggers and socks.