All parts are knitted flat and sewn up at the end. No circular knitting is required.
To make the body, I used DK yarn from different brands. The yardages by weight vary and they are 50g per 120-160m. If you use the same needle size throughout the project, it should work fine.
The body is worked in one, stuffed, wrapped with the jumper piece, and sewn to the body. The sleeves are worked separately and attached over the jumper; hence, the jumper is not removable, but the knitting process is easy. The gnome has large boots which make him stable. He stands on his own without support.
The crochet hook is to make chains and does not need to be precisely 3mm.

6 pages with assembly photos.
Yarn
DK (8-ply) yarn, 10g each
• A Khaki green
• B Oatmeal
• C Dark brown
• D Blue
• E Red
4-ply (fingering), small amounts
• F Gold
• G Coral pink
Chunky Boucle
• H White

Tools & Supplies
• 3mm knitting needles
• Chenille needle
• Stitch holder
• 3mm crochet hook
• A small amount of light brown DK
• 4mm mushroom-shaped amigurumi eye beads
• Cotton thread
• Toy stuffing