I found it!

I've been salivating after a fair isle sweater I saw on Facebook recently, and in the last week I actually found the pattern on Ravelry.  It's Adelaide, designed by Kate Gagnon Osborn.  The pattern was included in a book of vintage knits with modern twists:

That's Adelaide, on the cover.  I love the colors chosen, so I'll try to get the same when I order the yarn.  It calls for The Fibre Company's Terra (40% baby alpaca, 40% merino wool, 20% silk) and I'm going to save up to buy the yarn the pattern was written for.

There are plenty of additional great patterns inside, with at least two others that beg me to be knitted.  Who am I to tell them no?  :)