Jacobus is the cutest monkey on Ravelry. Jacobus is knit round in one piece, without any seams. The pattern is very extensive, featuring 40 pictures of the various stages in knitting and row by row instructions.
The pattern is available both in english and in dutch, when you buy the pattern you have access to both the file in dutch and in english.
You can knit Jacobus in whatever yarn you want, both monkies on the second picture are from the same pattern.
For the smallest one I used 30 grams of fingering weight sockyarn for the main color and 10 grams for the face, hands and feet, knit with needles 1,5mm (000). It measures 20cm (8 “).
Using DK/worsted yarn, you need 50 grams MC and about 20 grams CC, use needles 3 or 4 (3mm or 3,5mm). Your Jacobus will measure 35cm/14”.
For a large monkey, use aran or bulky, about 75 grams MC and 25 grams CC, needles 4mm-5mm, 6-8, and Jacobus measures 50 cm, 20”.
Jacobus has some nice clothing: a dress and overalls. They are on separate patterns, you find them in my pattern store.