I can't tell from the picture, but I'd exprect you'd have to knit a sweater vest. if not you might be able to figure out a gauge ( how many stiches per a certain width ) you could figure out what yarn. If you cannot at all knit this might be a bit difficult cause it will be smaller needles with fine yarn, but there are alternatives. If you can find a similar yarn in bulky weight in the exact shade you could 'cheat' a little and crochet it, which I find much easier. If you decide to do that than this will look similar and I can help you customize it if necessary.
Row 1: Sc in 2nd ch from hook and in each ch across - 4 sc at the end of this row.
Row 2: Ch 1, turn, working in back loops only, sc in each sc across.
From this Pattern Frosty Mittens