Thanks so much, everyone.
Penny, I would LOVE to find another of these tops. But alas, Cassis has gone the way of the Dodo. It was a terrific store for Canadian women with lovely, simple, higher quality clothes that nodded to trends without being overtaken by them -- sophisticated and elegant clothes with clean lines. This top was actually a gift from our own Celia who decided that that taupe colour didn't suit her so well.
I actually think this would be a super simple top to sew, however, and I have been wondering about Jayne's idea of buying fabric and taking it to a seamstress. There are no zippers or buttonholes except for the tab sleeves (which could easily be omitted as tabs). If you can sew, it would be the easiest thing in the world to make. I would actually like a couple of these in my key colours.