I knitted a hat, and DH liked it, but said it was a bit too short. So I picked up stitches and added 1-1/2 inches to it. I had also made a liner inside (wool/camel mmmmm so soft) and stitched that in too. Now, he looks almost dwarfed by the hat!
He was camping in the Sierras so he really appreciated it each morning, he says, when it was coldest. I love knitting for people who really like what I make. 8^)