Well I did the first tension square with a thumb cast on, and it is not going to happen in this yarn for me.
Second tension square was oh, what was it...can't remember but it was too tight.
Third tension square is cool, on bigger needles (I should just grab bigger needles the first time, really). So I am going with the whole thing on bigger needles, and I am going to cable cast on, but leave a gap at the bottom of the side seams, so that it is tidy and still has give.
K and F - rules don't work for me, unless they are laws of science or principles for a civilised society ( those I do follow - at least for most of the month

).
The yarn is Sirdar Snowdrops, and the pattern is just a very plain baby-small child jumper (and a hat).
Thank you all for chipping in - amazing how busy the boards get when you mention something as simple as cast on. And no one even voted!
