Try finding a shirt pattern with a mandarin color and adapt it for the tunic. I did that for my Ty lee cosplay.
Originally Posted by Lithium Flower
Once upon an evening dreary, while I lurked weak and weary,
Over many a quaint and curious volume of forgotten posts,
While I nodded, nearly napping, suddenly there came a bitching,
As of some one gently pitching, bitching at my chamber door.
`'Tis JasonTerror,' I muttered, `bitching at my chamber door -
Only this, and nothing more.'