brush of the yarn on your hand/thumb - is the yarn rough or soft? (depending on the wool it could be very soft)
how fine or thick is the yarn? (samples)
how long have you been doing the craft in one setting - your hands and wrists hurt and start to cramp up
How heavy is what you are working on? socks are light and easy to hold up. Sweaters are often heavy and can be hard to hold up. People sometimes use pillows to support their arms
texture of the cloth - there's bumps of the stitches. But you can also create texture - such as cables
how fine a yarn you use and how tight you knit affect the drape
what is the yarn made of? Cotton - usually thicker and heavier, wool can be super soft (Merino) or scratchy (carpet wools), alpaca (silky, lots of drape), llama is like wool, milk fiber - like silk, linen - cool and has nice sheen
depending on the time period and purpose, you may have lanolin (which is often found in lotion) still in the yarn. It's great for weather proofing.
The type of fiber in the yarn can affect it - there is still a yarn spinning factory in finland that processes a wool and dog hair blend - but it was a hugs amount (44 pounds at a time)
dyes - one common ingredient in dyes was urine (in modern dyes we use a chemically made Urea) to help the fabric stay wet and concentrate the dye in the vat
needles - may have a smell esp. when new. wood fresh carved and sanded smells lovely.
click of the needles - and the needle material will determine the sound
the SHHH of the drawing of the yarn from a center pull ball
the bump of a yarn ball rolling on the floor or in a container (yarn bowl, box, etc)