So far my main achievement has been a silky dressing gown (which I wear all the time). I cut it off a pair of pajamas, which meant that the neckline is really odd at the shoulders but luckily this is not that obvious when I'm wearing it.
Its main flaw is the belt, which slips terribly, I'm not really sure how to fix this. Plus I didn't clip my seam allowances, so the seams are all really heavy. Still you live and learn!