I have gotten LL Bean and other good name shirts at Goodwill before and the sleeves are long. Besides they are already washed and you know they aren't going to shrink up on you any more. Check the pattern books in the easy section for a pattern. I making a really pretty purple and lavender plaid with a silver stripe for a woman now. Just make sure you wash and dry the flannel a couple times before you cut it so it's finished shrinking. Then if you buy cheap flannel, it will pill up quickly. don't forget you need to match the plaid in the flannel too. You can buy plain colored flannel and prints.