So the higher the number, the thicker the chenille?
If it's Danville chenille which most is and even talking about New Age chnenille which is just some Rayon or Nylon chenille with Crystal added in. We have done that for a long time, but then someone started calling theirs New Age when it just regular chenille with crystal. All their sizes go from 00 to 12 and yes the larger the number the larger the chenille. Some places just call their small medium and large, which is just what they assigned size to it, but at Danville they have a number attached that tells size. They do not put all these names on the different colors other than the color name itself. All these names shops call a chenille is just a name they gave it, much like my Baitfish chenille, I gave it that name because it made me think of Baitfish! Most of the chenille I just call it what it is, but I do have a few like Junbug that I named it what I was trying to copy in soft plastic. However if you want some Purple and Gold, that is what I call it.
Other brands have a completely different way of telling size, like Estaz, they have a Petite, Standard and Grande. Petite I have never had in my hand so don't know, but Standard is 15mm and Grande is 30mm which if huge and high cost, but Estaz even covers the cotton core with Mylar so it's very different!
Others that are larger come as long hackle or something like that. I have some of that as well and come from Hareline. This kind come in one with 15mm hackles and then the large is something like 1 1/4" or 1 1/2" long hackles.
Then you have the stuff like Ultra Chenille or Velvet Chenille with a whole other kind of sizing. I am sure that are even more and I do even have more kinds, LOL!