Ok, for the ladies out there, I measured myself and my jersey.
Then left the note at home.
However, from memory (and I can only remember the inches):
I have a medium jersey. My bust is 36", my waist is 35/36 (depends if I suck in) and my hips are 38 (?not sure I've remembered that right. Definitely biggest of all anyway)
The widest part of the jersey (just under the arms, so sort of bust height) is about 40" round.
Dunno if that helps anyone.
Oh, and looking at the state of my shorts today, they are starting to shed lycra bits and go see-through in places, so I think I might treat myself to some new ones.