vivienne westwood shirt sizing and taking out suits

[masterpp]

hey guys, just wondering, i bought a shirt a bit too small- i got a size I. how much bigger is the size II. is it like shirt collar sizes, ie only goes up a half size, or is going from a I to II like going up a whole shirt size.

also, generally can one let out vivienne westwood suits on the shoulders and around the waist.

cheers

[masterpp]

guys help please