Here is a pretty scarflette for you to crochet that is fun and fast to make. These make wonderful gifts as they easily fit most people. You can adjust the size if need be by just lengthening or shortening the body of the scarflette.
This is about 4 1/2" wide by 27" long (total length) It will fit a 17" to 19" neck size.
You can use any type of bulky yarn. It takes just a little over a skein of yarn. However that depends upon how much yardage your skein has.
I would suggest using a soft, washable yarn since this will be worn close to the neck.