Welcome to the forum! I've only knit with chenille once, for a Christmas hat, and it was bulky. I think I used a 10 1/2 needle--metal. I used metal because I only use metal circs or straights.
The size of the needle depends on the size of the yarn. If I was going to knit with the bulky chenille that I used for a scarf, I would have gone up a size or two to make it a looser fabric.
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IngridKH on Ravelry