Line the entire bodice with a fabric that has similar care requirements as the wool. (I'd probably use blouse weight rayon, but that's because I have a lot of that hanging around.)
Or, bind all the edges with a contrasting or coordinating knit.
I don't like facings on jumpers (pinafore for the 'English' speakers), and I make a lot of jumpers (DD wears them all year). I find that facings are always flopping out unless I tack them into the shoulder and side seams, and a full bodice lining eliminates that problem. (they're also easier to press.....)
jenn
-- Jenn Ridley snipped-for-privacy@chartermi.net