In the spring issue of Knitty.com there is a free downloadable pattern of this sweater known as the "Andy". It is made with the O-Wool Balance, (50% organic Cottton and 50% Organic Wool) which is a light weight worsted yarn. I think most men who would find a heavy wool sweater too warm for indoor wear would really appreciate this comfortable sweatshirt like garment.
You can find this pattern at http://www.knitty.com/ISSUEspring09/PATTandy.php
The colors used in this model are agate (brown) and malachite (green).
Jillian Moreno has designed such an interesting garment. I love the leaf pattern, and the twisted rib that almost hides under the arms and against the sides of the body. The malachite bands are knit from another ball of yarn, with twisting of the yarn to prevent holes.