Latvian mittens were knit originally on needles varying in size from 0-0000 (2-1.25 mm, 13-16 English). The yarn was usually a fine 2-ply homespun similar to an 8/2 weaving yarn or as fine as a “fingering yarn”. The pattern asks that you find your own gauge with your own needles and yarn and then adjust the graph based on a sizing chart at the back of the book.