The Rainbow Folk Sweater is a really fun pattern to knit and it makes the coziest sweater. Full instructions are given on how to make the sweater the perfect length. You may want it long, tunic style or you could make it cropped!
It is knitted flat and sewn together at the end. There is also an option to knit it bottom up, partially in the round for the intermediate knitter. You can find the instructions for this at the end of the pattern