I made this slightly altered t-shirt scarf for extremely cheap. I bought the XXXL t-shirt from Wal-Mart for $4. The lace I had as scrap from another project.
You can find out how to make a tshirt scarf like the one below at this link.
I cut the piece of lace at the same width of the scarf. Then I cut one side of the lace creating just a regular scarf.
Then I hand sewed the lace in with white thread and did this again at the other end.
Then I had this wonderful infinity lace scarf...
When doubled over it creates one whole side of lace on the scarf.