i think you could make this with tunisian. when it gets the the split, you could keep working half the stitches until both halves are long enough and then start stitching across the entire piece again at the other end.
A handmade crochet bikini or crop. This top is perfect for summer days - it is fully lined and can be worn swimming. The top has a halter neck and tie (this is super cute, and I love this as a crop top as well!