Over the weekend it occurred to me why I like this design so much. 3/4 sleeve tops are slimming because the sleeves end right about waist level. This draws the eye to the waist, which on most of us is one of the smaller bits of our body. Unfortunately, 3/4 sleeve tops aren't as warm as long sleeve tops, because your lower arm is hanging out. This design has long sleeves, so you stay warm, but the stripes end where a 3/4 length sleeve would end, drawing the eye to the waist, and being slimming! So it's flattering and you stay warm - win, win!
Also, the design has stripes and I'm a little obsessed with stripes at the moment (you might have noticed).