I made a scarf once (hand sewn, not knitted, this was a pre-knitting scarf) and it's about 72" long, and 24" wide. That way, I can wear it as a scarf, wrapping it once around my neck, or wear it as a shawl for when it's chilly but not cold enough for a coat, or wear it over my head to keep my ears warm when it's windy.
It's also bright red, and since I almost always wear black, it makes a striking statement. I almost always get comments on it. I bought two yards of fabric and hand-sewed the edges together during a lecture class.