Bobby
I wore a pair of Ron Hill leggings and a thermal top, threw on a Gilet for the cycle and took it off again for the run.
Not sure I'm the right person to ask for advice on this but you shouldn't slip off the machine with cycling shorts. I have a wonderful shiny lycra I sometimes wear for rowing and I don't fall off with that
Jonny,
Sound s great about the cycling, esp as I'll not be rowing from March onwards