This raglan cardigan is worked from top to bottom. It is made with sc alternating between rows in flo and blo, which gives it a loose structure.
Ch 1 at the beginning of a row does not count as a stitch.
To maintain the structure of the stitch, the sleeves are not worked in the round, after each row, join it with a sl st, turn the piece and continue in the other direction.
You can, of course, make a longer cardigan or sleeves, but remember that the amount of yarn given in the description is suitable for a cardigan with the specified measurements.