If you work a row of single crochet into your starting chain this would give a firm edge for a scarf and finish the same way.

Or

If you worked out from the starting chain until its half the length you needed then start again working in the other direction from the starting chain it would mark a great stole or wrap.

This pattern/chart has been adapted (with her permission and thanks) from the much loved virus shawl by Julia Marquardt (link to her original pattern/chart below).