...Is a Concept
that is owned not the components that structure the concept...
Do Re Mi
is a component...How you arrange it musically is your own unless you sample someone else's concept
exactly for sale...same with needlework!
It's a slippery slope...An experienced knitter/crocheter/seamstress can look at a garment, ID the stitch/structure and replicate it...It's called a "Knock-Off!" and legal.
Buy that persons pattern and recreate verbatum for sale, that is infringement.
I'm totally on the side of ethics but sometimes, it's hard to tell when and where the line has been crossed with something that have been given away on the internet no less.