I found myself in the car as a waiting room while driving someone to appointments last year, and of course I took my knitting! This hat came out of several trips as I only worked on it during those waiting periods, but it could be finished much faster if you focused on it.

This hat has a lace repeating pattern, worked from the bottom up, and can be adjusted for size by using different needles/yarn (go up a size or two for extra large or down for smaller hats).