Chain an even amount of chains until you've reached your desired width.
R1: Single crochet in the 2nd chain from the hook, *chain 1, skip chain space, single crochet in next chain space; Repeat from * across, single chain in last chain space.
R2: chain 2, turn; Single crochet in chain space of previous row, *chain 1, single crochet in next chain space of previous row. Repeat from * across.
Repeat R2 until desired length, bind off
Hint for best results in finishing is to leave ends long and weave the ends through the work using a tapestry needle.