I just saw this vest pattern the other day made from heavy/bulky weight worsted (Roxy Yarns is having a sale on Cascade Magnum). I have not made it but I'm considering ordering the pattern.
There's a great zippered vest in Simply Beautiful Sweaters for Men in heavy yarn (I think it's doubled) with a simple cable on each side and pockets - I made it for myself for golf and love it. Dicksie