This pattern appears on the Lion Brand blog.

Into Spring is a crochet pattern for an infinity scarf that transitions you to Spring by allowing you to wear it as a poncho. The buttons (which do not require planning button holes!) are sewn at the end of a simple rectangle. You choose whether to button it into a continuous loop (infinity scarf) or fold it to wear as a poncho.

This pattern is written for one size and requires 3 balls of New Basic 175 in Peony. You can resize the pattern with minimal changes, however, adding length or increasing width will change the yardage used.