The Incredible Custom Fit Raglan Sweater pattern is great for things like this. It shows you how to use any weight yarn and make a custom sweater or cardigan for anyone. You can also choose what type of collar to put on it.
I don't know of a free one, but one thought is to check the yarn company sites and see what patterns are available for their bulky yarns.
I have a Better Homes and Gardens Knitted Cold-Weather Sweaters booklet that has a collared long (down to the knee) bulky, cabled sweater that probably could be adjusted for length. I don't recall where I got it. It says that it's a Leisure Arts Publication.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
I was thinking the same thing as Julie. There is a great bulky cardigan pattern there. It's on my list of to dos!
You can check out the website for this authors, who own a yarn shop in NYC. http://www.theyarnco.com Some of the patterns in their books can be bought individually on the site. But wouldn't you know, I couldn't find the cardigan one I was thinking of!