since she didn't answer, i'll try to help you out (if that's ok. )
k3 p3 means knit 3 stitches then purl 3 stitches. k2tog means knit 2 together.
I don't think she doubled the yarn. I think she just used super bulky weight yarn (the thickest they sell it). & she used 15mm needles, which are pretty big, so I think that's why the stitches really stand out.
Thank you. Sorry it took so long to respond. I just now saw this. Been out of the loop for a while. I attempted to make my own but crochet instead of knit. It worked out okay but was super heavy, and hers looks pretty light. Thank you again I'll give it another go soon as I am able
Yes, it has been a while; long enough that I've had the chance to actually try knitting one! I would definitely go for the super bulky yarn (something like this [link] ) or two strands of worsted weight yarn (I tried this, but didn't finish it. what I have seems light enough though). I hope that you get the result you are looking for!