I did the applique very simply. First I basted a scrap piece of cotton velour onto the front of the jersey.
Then I traced the design onto a piece of Glad Press'n'seal and pressed it over the velour. It works as a stabiliser as well as marking the design. It holds in place without any shifting, and can be removed easily without leaving any residue.
Then I satin stitched over the outline.
Then I pulled out the press'n'seal and very carefully cut away the excess velour. I wanted the slightly fuzzy outline, so this method suited. For a clean satin stitched edge I'd have done a wider zigzag, pulled out the plastic and cut off the excess, then done a closer spaced zig zag.
It didn't take long to do the applique, and constructing the jersey itself took less than an hour. (My coffee didn't even get cold.) Not bad for instant gratification. I have more of the fabric, so I'll have to think of something girly to make for Isabella.