I've had a play around with several different methods. First was a play with cloth. I had too, it was tempting me. Then I had a look at building a polygon shirt from scratch. That just wound me up. Then I 'cut' the shirt out of shiko herself and just duplicated faces and played around with the vertices.

The one u see there is the cloth version. I thought I'd get it up and on here as soon as i was able... not sure what i'm going to stick with though... any ideas anyone?