Wheee! I finished my vest about a week & a half ago!
I used knitpicks merino style. I'm actually thinking of knitting another one in a more neutral colour combo & have thought about using telemark.
If you go to the Vest-along blog (http://vestalong.blogspot.com/) , there's someone who's knitting up a swatch of the telemark & is going to report back on how it works out. So far, she says it's really soft & her colours look really great.
I had this black fabric in my stash, so that's why I used it - but now I'm going to make more! The pattern was really easy & It took me about 1 1/2 hours to sew the whole thing. I cannot tell you how great this fit is for the curvier girl - I'm *so* glad this pattern comes all the way up to 20. I bought the other blouse pattern & the jacket pattern - I'm excited to sew them!