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 used Patons Shetland Chunky Tweeds in Medium Blue and just about 1/4 of one skein of Cascade 220 in a dark purple for the end flounce. I would suggest using a soft, washable yarn since this will be worn close to the neck.
You can download a PDF of the pattern here. Crocheted Scarflette
The video instruction is in 4 parts...
How to start a Scarflette - How to begin and have even sc rows.
A Scarflette Loop - Making the pocket for the end of the scarf to pull through.
Learning Front/Back Post Double Crochet - Making the body of the scarflette.
Completing the Scarflette - Finishing and making the flounce and scalloped edge.