1. Hobbies & Games  Discuss in my forum  Does Ply Have Anything
to Do with Yarn Weight?   Question: Does Ply Have Anything to Do
with Yarn Weight?  Blame it on inconsistent definitions of yarn
weights and a bit of knitting history that some people assume
that yarn ply has something to do with the weight of yarn you're
working with. The truth is a lot more complicated than that.
Back in the good old days when most people were knitting with
wool yarn, ply actually did mean something when it came to the
weight of yarn. A ply was always a consistent size, so a 2-ply
yarn was very thin, while an 8-ply yarn was much bigger.
There's no such thing as a 1-ply yarn, by the way; technically,
that's called a singles yarn. The singles are plied to create
yarns of different thicknesses, but there's no longer any
consistency as to the yarn's weight based on the number of
plies.  A 4-ply yarn can be bulky or medium weight, while a
singles can be super thin or super bulky, or anything in between
for that matter.  Because t