There isn’t really a pattern, per se, I flipflopped between a couple of cardigan patterns to figure out how the squares would go together, and mishmashed things from a couple of patterns that I’ve accumulated from Etsy and Ravelry lol.
I took this here sun granny square:
and applied its outer border - starting from the star stitch - to the moon from this set:
and this star pattern:
and did my best to make them all ~8" wide - I think they all also had approximately 29 stitches per side, but I know for fact they were not all even.
After figuring out the layout of the squares, I used a single crochet to stitch them all together. Once that was done, I started with the cuffs to make the sleeves, doing a lot of increasing to make them as slouchy as they are. While making them, I regularly put on the attached squares, and slipped the in-progress sleeve onto my wrist to see if it was long enough.
For the cuffs and the edge ribbing, I used the ribbing from this vest pattern I used earlier this year:
except I started it with 9 chains.
As for the colors, I used Red Heart yarn in Peacock, Saffron, and Lemo - I’m afraid I don’t know the name of the light blue, as I got it years ago and did not keep the label. And I did the whole thing with a 5mm hook, save for the ribbing which was done, if I remember correctly, with a 4.25mm.
Not quite a pattern, but I hope this helps!