Here is the link to a photo of the pattern:
http://www.bhkc.co.uk/BHKC%20Pattern...58/ukhka58.jpg
I can tell you what I would do, as opposed to trying to convert that exact one-- I'd find a cardigan that is very similar to the basic design on
www.knittingpatterncentral.com or
www.garnstudios.com and then find a "frill" or ruffle instructions in a design book such as The Harmony Stitches books, or Vogue Stitionaries, make one as long as the chest measurement, and then sew it on.