It's better if you tell us the yardage and weight of the yarn. I'm not sure that's enough for a sweater anyway, but here's some patterns for that size needles.
This one is size 15 needles, but it will be fine on 17. It'll just be slightly looser.
One comment...if your yarn is not a super bulky yarn the results will NOT look like these patterns. If you have a worsted weight you'll get a lacy effect from needles that large.