This was inspired -nay- pretty much stolen from a top I saw in Cyberdog XD
So I went off and decided to make my own verson instead of spending a small fortune on one that costs very little (as it turned out) to make.
It's really easy. Honest. I'd never done a pattern before and I found it very simple, so just go out and find a pattern for a simple longsleeved shrug and you've got all you need. Just remember to shorten the arm bits a little so the poofy bits will fit nicely- and not dangle about at foot below your hands!
It's so simple! >^.^<