Use the Daniel chibi doll pattern for the arms to finish the sweater. Making the sleeves is simply a change of color or two and leaving out the stripes. Everything else remains the same in the pattern. You can make one arm differ from the other by adding a watch band in dark brown. Either arm therefore includes a color change in Round 5.

Rnd 5 of the arm: in the 2nd decrease (dec), switch to dark brown for arm 1 and to the sweater color for arm 2.  Continue with pattern instructions. For arm 1 only, in the last sc of Rnd 6 switch to the sweater color. Finish the remaining rounds in the sweater color for both arms.