The body and sleeves are worked back and forth and down top separately, and then join them together by sewing.
A video of how to knit a perfect popcorn has been uploaded by instagram: jjloveknitting

This pattern includes direction for sizes of XS/S (M/L)

Needles: 3.25/3.75mm needle

Notions: one sewing needle, one marker, 5 nos. of 20mm button