So, I've worn this tunic a couple of times before (here and here), but I've always had a bone to pick with it. The combination of the poofy, elasticized sleeves and my intimidating shoulders and lethal guns (hehehehehehe) was resulting in all sorts of obnoxious sleeve creeping and bunching that drove me crazy. So, if you can't beat 'em, cut 'em. That's what I always say.
Now that I've removed the elastic and hemmed them into a lovely set of flutter sleeves, I am soooooo much more comfortable wearing it. I know a lot of people who can't imagine altering a piece of new clothing. If it doesn't work for you, it's not worth it. It totally pays to know your way around a sewing machine, a pair of scissors and a straight stitch. You'll get so much more personality and style out of your wardrobe.