In The Hebrides is currently out of print (2012), but the pattern for this vest is available as part of a kit through Alice Starmore’s website at the link given below (correct as of 27 Jan 2012). The description for the kit says
This kit includes a colour-printed pattern card with full instructions and all the yarn required to make Roscalie in your chosen size. This is an ideal first project for a knitter who wants to make a garment in the round using the stranded technique with steeks.
and the sizes of the completed knitted garment knitted at gauge are
Petite - Underarm 102.75cm Length 53cm
Small - Underarm 108.5cm Length 54.5cm
Medium - Underarm 114.25cm Length 57.75cm
Large - Underarm 120cm Length 60.75cm
X Large - Underarm 125.75cm Length 63cm